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英语选择性必修 第一册Unit 5 Revealing nature优秀课件ppt
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这是一份英语选择性必修 第一册Unit 5 Revealing nature优秀课件ppt，共27页。PPT课件主要包含了decline，tortoise，blame，goat，primitive，worldwide，giant，mangtove， iguana，comb-like等内容，欢迎下载使用。
Uning language
Step 1. When t use Past perfect
Step 2. The difference between past perfect present perfect and simple past
Step 3. Exercises
________________________________________________________________________________________________________________________________________________________
Using Language
1. n.特征，特性2. v.减少3. n.陆龟4. v.责怪，指责；把……归咎于5. n.山羊6. 源于……的，原产于……7. adj.原始的，低等的8. adv. 遍及全世界
characteristic
be native t
8. adj.巨大的，特大的9. 巨型陆龟10. n.红树（一种热带树木）11. n.鬣蜥(一种大型热带美洲蜥蜴)12. adj.梳状的13. n.(动物的)刺，刺毛
giant trtise
Darwin suspected that the finches had evlved frm a cmmn ancestr,...
In this sentence the tw actins bth hanppened in the past, Actin B happened first, Actin A happened later. In this situatin, past perfect is used t describe Actin B and simple past is used t describe Actin A .
happening first
happening later
Many peple refused t believe that living things, including humans, had evlved frm lwer frms f life.
The past perfect is a verb tense which is used t shw that an actin tk place nce r many times befre anther actin / pint in the past.
Past Perfect FrmsThe past perfect is frmed using had + past participle. Questins are indicated by inverting the subject and had. Negatives are made with had nt.Statement: Yu had studied English befre yu mved t New Yrk.Questin: Had yu studied English befre yu mved t New Yrk?Negative: Yu had nt studied English befre yu mved t New Yrk.
The past perfect expresses the idea that smething ccurred befre anther actin in the past. It can als shw that smething happened befre a specific time in the past.
past perfect
simple past
1. I ____________(nt see) such a beautiful beach befre I went t Kauai.2. I did nt have any mney because I ________(lse) my wallet.3. Tny knew Istanbul s well because he ___________(visit) the city several times.4. ______ Susan _______(study) Thai befre she mved t Thailand?5. She nly understd the mvie because she _________(read) the bk.6. Kristine _____________(never be) t an pera befre last night.7. We were nt able t get a htel rm because we ______________(nt bk) in advance.8. A: _______ yu ever _______(visit) the U.S. befre yur trip in 2006?B: Yes, I ____________ t the U.S. nce befre.
hadn't seen
had visited
had never been
hadn't bked
USE 2 Duratin Befre Smething in the Past (Nn-Cntinuus Verbs)With nn-cntinuus verbs (simple past), we use the past perfect t shw that smething started in the past and cntinued up until anther actin (nn-cntinuus verbs) in the past.
simple past(nn-cntinuus
past perfect duratin
1. We had had that car fr ten years befre it brke dwn.2. By the time Alex finished his studies, he had been in Lndn fr ver eight years.3. They felt bad abut selling the huse because they had wned it fr mre than frty years.
nn-cntinuus verb
The wrds "live," "wrk," "teach," and "study" are smetimes used in this way even thugh they are NOT nn-cntinuus verbs.
ADVERB PLACEMENTAdverbs such as always, nly, never, ever, still and just are usually placed between had and past participle.Examples:Yu had previusly studied English befre yu mved t New Yrk.Had yu previusly studied English befre yu mved t New Yrk?
ACTIVE / PASSIVEActive vice: had + past participlePassive vice: had + been + past participleActive:Gerge had repaired many cars befre he received his mechanic's license.Passive:Many cars had been repaired by Gerge befre he received his mechanic's license.
Cmplete the paragraphs with the infrmatin frm the given sentences. The sentences are in the rder in which they happened. The can help yu decide the use f tenses.
a. Natural disasters led t fd shrtages in the 1960s.b. Yuan Lngping began t d research n hybrid rice. c. Yuan Lngping develped a better type f rice.
Yuan Lngping _____________t d research n hyarid rice because natural disasters______________fd shrtages in the 1960s. In the end, he ____________ a better type f rice.
a. Gregr Mendel chse t study pea plants because their characteristics were easy t cntrl.b. Gregr Mendel made imprtant discveries abut genetics.c. Gregr Mendel died in 1884
Gregr Mendel ___________study pea plants because their characteristics were easy t cntrl. By the tirme f his death in 1894, he ___________________discveries abut genetics.
had made imprtant
Cmplete the nline encyclaepia entry eith the crrect frm f the wrds in the bx.
cmpetedeclineeatliveintrducearrive
Lnesme Gerge was the last Pinta Island trrise. He died in 2012. After Gerge's death, the Pinta Island trtise was declared exinct. The extinctin f the Pinta Island trtise is blamed n humans. Befre humans __________n the island, the species ___________in islatin and ___________plants that naturally grew there. Gerge was discvered many years after their arrival, and by then humans ___________new species that _________ fr the fd the trtises ate. After gats in particular had been brught t the island, the Pinta Island trtise ppuatin____________. Eventually nly Gege remained.
过去完成时与一般过去时的区别
1. 时间状语不同：过去完成时在时间上 强调“过去某个时间之前”；而一般过去 时只强调过去某一特定的时间。
They had arrived at the statin by ten yesterday.
They arrived at the statin at ten yesterday.
2.过去完成时表示过去的过去，经常和一般 过去式一起使用。表示过去发生的一 先一后的两个动作，先发生的动作用过去完成时，后发生的动作用一般过去时。
She had never seen a bear befre she mved t Alaska.
Gerge had repaired many cars befre he received his mechanic's license.
I can't believe I __________(get) that apartment. I __________(submit) my applicatin last week, but I didn't think I had a chance f actually getting it. When I __________ (shw) up t take a lk arund, there were at least twenty ther peple wh__________ (arrive) befre me. Mst f them ________________(fill, already) ut their applicatins and were already leaving. The landlrd said I culd still apply, s I did.
had arrived
had already filled
I __________(try) t fill ut the frm, but I culdn't answer half f the questins. They __________(want) me t include references, but I didn't want t list my previus landlrd because I __________(have) sme prblems with him in the past and I knew he wuldn't recmmend me. I __________(end) up listing my father as a reference.It was ttal luck that he __________(decide) t give me the apartment. It turns ut that the landlrd and my father__________ (g) t high schl tgether. He decided that I culd have the apartment befre he__________ (lk) at my credit reprt. I really lucked ut!
过去完成时与现在完成时的区别
现在完成时表示的动作发生在过去，以nw的时间为基点，但侧重对nw产生的结果或造成的影响；过去完成时则是一个相对的时态，以过去时间为基点，它所表示的动作不仅发生在过去，更强调“过去的过去”，只有和过去某时或某动作相比较时，才用到它。如：到目前为止我已经学会了 1000 个英语单词。到那时为止我已经学会了 1000 个英语单词。— I'm srry t keep yu waiting. — Oh, nt at all. I ___________(be) here nly a few minutes.
I have learned 1000 English wrds by nw.
I had learned 1000 English wrds till then.
1. When I __________(arrive) hme last night, I discvered that Jane __________(prepare) a beautiful candlelight dinner. 2. Since I began acting, I __________(perfrm) in tw plays, a televisin cmmercial and a TV drama. Hwever, I ____________________(speak, never even) publicly befre I came t Hllywd in 2010. 3. By the time I gt t the ffice, the meeting _______________(begin, already) withut me. My bss __________(be) furius with me and I __________(be) fired.
had prepared
had even never spken
had already begun
4. When I __________ (turn) the radi n yesterday, I __________(hear) a sng that was ppular when I was in high schl. I _____________ (hear, nt) the sng in years, and it (bring) back sme great memries. 5. Last week, I __________ (run) int an ex-girlfriend f mine. We _____________ (see, nt) each ther in years, and bth f us _____________ (change) a great deal. I ___________ (enjy) talking t her s much that I _____________(ask) her ut n a date. We are getting tgether tnight fr dinner.
haven't heard
haven't seen
have changed
6. When Jack __________(enter) the rm, I_________________(recgnize, nt) him because he __________(lse) s much weight and __________(grw) a beard. He lked ttally different! 7. The Maya established a very advanced civilizatin in the jungles f the Yucatan; hwever, their culture _____________________(disappear, virtually) by the time Eurpeans first __________(arrive) in the New Wrld. 8. I __________(visit) s many beautiful places since I __________(cme) t Utah. Befre mving here, I ________________(hear, never) f Bryce Canyn, Zin, Arches, r Canynlands.
didn't reggnize
had virtually dsappeared
have visited
had never heard
1. She said that she __________(see) the film befre.2. After he _____________ his hmewrk, he went t bed.3. I met Wang Ta in the street yesterday. We __________ each ther since he went t Beijing.4. I _____________ reading the nvel by nine 'clck last night.5. It was the third time that he __________(be) ut f wrk that year.6. I didn’t knw a thing abut the verbs, fr I ____________(nt study)my lessn.
had finished
hadn't studied
Cmplete the paragraph with the crrect frm f the wrds and expressins
ancestrscientificbe native tprimitivehabitatappearancebe hme tecsystem
The Galapags Islands are renwned wrldwide fr their unique bidiverity. The Giant Trtise Reserve n Santa Cruz ______________several species f giant trtise that ___________the Galapags Isand. The Island is als hme t the Charles Darwin Research Statin, where ___________studies are carried ut.Mangrves are ne f the castal plants that grw n Isabela. They serve as the __________fr varius birds and fish and are very imprtant t the __________.Iguanas can be fund n San Cristbal. They hae a very special__________, with cmb-like spines n their back. There is evidence that all the different iguanas have develped frm mre___________nes and share a cmmn __________.
are native t
Uning language
Step 1. When t use Past perfect
Step 2. The difference between past perfect present perfect and simple past
Step 3. Exercises
________________________________________________________________________________________________________________________________________________________
Using Language
1. n.特征，特性2. v.减少3. n.陆龟4. v.责怪，指责；把……归咎于5. n.山羊6. 源于……的，原产于……7. adj.原始的，低等的8. adv. 遍及全世界
characteristic
be native t
8. adj.巨大的，特大的9. 巨型陆龟10. n.红树（一种热带树木）11. n.鬣蜥(一种大型热带美洲蜥蜴)12. adj.梳状的13. n.(动物的)刺，刺毛
giant trtise
Darwin suspected that the finches had evlved frm a cmmn ancestr,...
In this sentence the tw actins bth hanppened in the past, Actin B happened first, Actin A happened later. In this situatin, past perfect is used t describe Actin B and simple past is used t describe Actin A .
happening first
happening later
Many peple refused t believe that living things, including humans, had evlved frm lwer frms f life.
The past perfect is a verb tense which is used t shw that an actin tk place nce r many times befre anther actin / pint in the past.
Past Perfect FrmsThe past perfect is frmed using had + past participle. Questins are indicated by inverting the subject and had. Negatives are made with had nt.Statement: Yu had studied English befre yu mved t New Yrk.Questin: Had yu studied English befre yu mved t New Yrk?Negative: Yu had nt studied English befre yu mved t New Yrk.
The past perfect expresses the idea that smething ccurred befre anther actin in the past. It can als shw that smething happened befre a specific time in the past.
past perfect
simple past
1. I ____________(nt see) such a beautiful beach befre I went t Kauai.2. I did nt have any mney because I ________(lse) my wallet.3. Tny knew Istanbul s well because he ___________(visit) the city several times.4. ______ Susan _______(study) Thai befre she mved t Thailand?5. She nly understd the mvie because she _________(read) the bk.6. Kristine _____________(never be) t an pera befre last night.7. We were nt able t get a htel rm because we ______________(nt bk) in advance.8. A: _______ yu ever _______(visit) the U.S. befre yur trip in 2006?B: Yes, I ____________ t the U.S. nce befre.
hadn't seen
had visited
had never been
hadn't bked
USE 2 Duratin Befre Smething in the Past (Nn-Cntinuus Verbs)With nn-cntinuus verbs (simple past), we use the past perfect t shw that smething started in the past and cntinued up until anther actin (nn-cntinuus verbs) in the past.
simple past(nn-cntinuus
past perfect duratin
1. We had had that car fr ten years befre it brke dwn.2. By the time Alex finished his studies, he had been in Lndn fr ver eight years.3. They felt bad abut selling the huse because they had wned it fr mre than frty years.
nn-cntinuus verb
The wrds "live," "wrk," "teach," and "study" are smetimes used in this way even thugh they are NOT nn-cntinuus verbs.
ADVERB PLACEMENTAdverbs such as always, nly, never, ever, still and just are usually placed between had and past participle.Examples:Yu had previusly studied English befre yu mved t New Yrk.Had yu previusly studied English befre yu mved t New Yrk?
ACTIVE / PASSIVEActive vice: had + past participlePassive vice: had + been + past participleActive:Gerge had repaired many cars befre he received his mechanic's license.Passive:Many cars had been repaired by Gerge befre he received his mechanic's license.
Cmplete the paragraphs with the infrmatin frm the given sentences. The sentences are in the rder in which they happened. The can help yu decide the use f tenses.
a. Natural disasters led t fd shrtages in the 1960s.b. Yuan Lngping began t d research n hybrid rice. c. Yuan Lngping develped a better type f rice.
Yuan Lngping _____________t d research n hyarid rice because natural disasters______________fd shrtages in the 1960s. In the end, he ____________ a better type f rice.
a. Gregr Mendel chse t study pea plants because their characteristics were easy t cntrl.b. Gregr Mendel made imprtant discveries abut genetics.c. Gregr Mendel died in 1884
Gregr Mendel ___________study pea plants because their characteristics were easy t cntrl. By the tirme f his death in 1894, he ___________________discveries abut genetics.
had made imprtant
Cmplete the nline encyclaepia entry eith the crrect frm f the wrds in the bx.
cmpetedeclineeatliveintrducearrive
Lnesme Gerge was the last Pinta Island trrise. He died in 2012. After Gerge's death, the Pinta Island trtise was declared exinct. The extinctin f the Pinta Island trtise is blamed n humans. Befre humans __________n the island, the species ___________in islatin and ___________plants that naturally grew there. Gerge was discvered many years after their arrival, and by then humans ___________new species that _________ fr the fd the trtises ate. After gats in particular had been brught t the island, the Pinta Island trtise ppuatin____________. Eventually nly Gege remained.
过去完成时与一般过去时的区别
1. 时间状语不同：过去完成时在时间上 强调“过去某个时间之前”；而一般过去 时只强调过去某一特定的时间。
They had arrived at the statin by ten yesterday.
They arrived at the statin at ten yesterday.
2.过去完成时表示过去的过去，经常和一般 过去式一起使用。表示过去发生的一 先一后的两个动作，先发生的动作用过去完成时，后发生的动作用一般过去时。
She had never seen a bear befre she mved t Alaska.
Gerge had repaired many cars befre he received his mechanic's license.
I can't believe I __________(get) that apartment. I __________(submit) my applicatin last week, but I didn't think I had a chance f actually getting it. When I __________ (shw) up t take a lk arund, there were at least twenty ther peple wh__________ (arrive) befre me. Mst f them ________________(fill, already) ut their applicatins and were already leaving. The landlrd said I culd still apply, s I did.
had arrived
had already filled
I __________(try) t fill ut the frm, but I culdn't answer half f the questins. They __________(want) me t include references, but I didn't want t list my previus landlrd because I __________(have) sme prblems with him in the past and I knew he wuldn't recmmend me. I __________(end) up listing my father as a reference.It was ttal luck that he __________(decide) t give me the apartment. It turns ut that the landlrd and my father__________ (g) t high schl tgether. He decided that I culd have the apartment befre he__________ (lk) at my credit reprt. I really lucked ut!
过去完成时与现在完成时的区别
现在完成时表示的动作发生在过去，以nw的时间为基点，但侧重对nw产生的结果或造成的影响；过去完成时则是一个相对的时态，以过去时间为基点，它所表示的动作不仅发生在过去，更强调“过去的过去”，只有和过去某时或某动作相比较时，才用到它。如：到目前为止我已经学会了 1000 个英语单词。到那时为止我已经学会了 1000 个英语单词。— I'm srry t keep yu waiting. — Oh, nt at all. I ___________(be) here nly a few minutes.
I have learned 1000 English wrds by nw.
I had learned 1000 English wrds till then.
1. When I __________(arrive) hme last night, I discvered that Jane __________(prepare) a beautiful candlelight dinner. 2. Since I began acting, I __________(perfrm) in tw plays, a televisin cmmercial and a TV drama. Hwever, I ____________________(speak, never even) publicly befre I came t Hllywd in 2010. 3. By the time I gt t the ffice, the meeting _______________(begin, already) withut me. My bss __________(be) furius with me and I __________(be) fired.
had prepared
had even never spken
had already begun
4. When I __________ (turn) the radi n yesterday, I __________(hear) a sng that was ppular when I was in high schl. I _____________ (hear, nt) the sng in years, and it (bring) back sme great memries. 5. Last week, I __________ (run) int an ex-girlfriend f mine. We _____________ (see, nt) each ther in years, and bth f us _____________ (change) a great deal. I ___________ (enjy) talking t her s much that I _____________(ask) her ut n a date. We are getting tgether tnight fr dinner.
haven't heard
haven't seen
have changed
6. When Jack __________(enter) the rm, I_________________(recgnize, nt) him because he __________(lse) s much weight and __________(grw) a beard. He lked ttally different! 7. The Maya established a very advanced civilizatin in the jungles f the Yucatan; hwever, their culture _____________________(disappear, virtually) by the time Eurpeans first __________(arrive) in the New Wrld. 8. I __________(visit) s many beautiful places since I __________(cme) t Utah. Befre mving here, I ________________(hear, never) f Bryce Canyn, Zin, Arches, r Canynlands.
didn't reggnize
had virtually dsappeared
have visited
had never heard
1. She said that she __________(see) the film befre.2. After he _____________ his hmewrk, he went t bed.3. I met Wang Ta in the street yesterday. We __________ each ther since he went t Beijing.4. I _____________ reading the nvel by nine 'clck last night.5. It was the third time that he __________(be) ut f wrk that year.6. I didn’t knw a thing abut the verbs, fr I ____________(nt study)my lessn.
had finished
hadn't studied
Cmplete the paragraph with the crrect frm f the wrds and expressins
ancestrscientificbe native tprimitivehabitatappearancebe hme tecsystem
The Galapags Islands are renwned wrldwide fr their unique bidiverity. The Giant Trtise Reserve n Santa Cruz ______________several species f giant trtise that ___________the Galapags Isand. The Island is als hme t the Charles Darwin Research Statin, where ___________studies are carried ut.Mangrves are ne f the castal plants that grw n Isabela. They serve as the __________fr varius birds and fish and are very imprtant t the __________.Iguanas can be fund n San Cristbal. They hae a very special__________, with cmb-like spines n their back. There is evidence that all the different iguanas have develped frm mre___________nes and share a cmmn __________.
are native t
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