Unit8 SectionA Grammar Focus 课件 2026学年人教版英语八年级下册

这是一份人教版（2024）八年级下册（2024）Unit 8 Making a DifferenceSection A课前预习ppt课件，共26页。PPT课件主要包含了过去分词的不规则变化，AAA，ABB，ABA，ABC等内容，欢迎下载使用。
By the end f this lessn, we will be able t：1.identify the present perfect tense with fr and since;2.use fr and since crrectly t describe the duratin f actins;3.apply the grammar t talk abut persnal r imagined vlunteer experiences.
Learning Objectives
1.Yu ____________ an enemy.你杀死了一个敌人。2.Yur team ___________ a twn.你的队伍摧毁了一座防御塔。3.Yur team _____________a crucial kill.你的队伍已经夺回了关键杀戮。
slain(slay的过去式)
has destryed
has reclaimed
1. Yu ____________ an enemy. 你杀死了一个敌人。
have slain
1. 以前某个时间发生或者已经完成的动作或状态对现在造成的影响或结果。 2. 表示过去已经开始并一直持续到现在的动作或状态。 3. 表示一个动作到现在已经发生了多少次。
(一)现在完成时定义：
的那一刻起,“敌人死亡”的状
•••••••••••••••
I killed an enemy.
I wn the game.
I have already killedan enemy.
1. 以前某个时间发生或者已经完成的动作或状态对现在造成的影响或结果。
2. 表示过去已经开始并一直持续到现在的动作或状态。
He mved（搬去） t Guangzhu 2 years ag.
He lives in Guangzhu nw.
He has lived in Guangzhu fr 2 years.
I read The Old Man and the Sea fr the first time.
I'm nt tired f it.
Even thugh I've already read The Old Man and the Sea three times, I'm nt tired f it yet.
I read The Old Man and the Seafr the secnd time.
3. 表示一个动作到现在已经发生了多少次。
I read The Old Man and the Sea fr the third time.
cut - cut - cut,   cst - cst - cst
bring - brught - brught, say - said - said
cme - came - cme, run - ran - run
am/is - was - been,   are - were - been
d/des - did - dne,   see - saw - seen
巩固训练 写出下列动词的过去式和过去分词。
see___________ have___________　　 eat ____________d____________ meet__________ be _____________ take__________ keep____________ buy_____________ spend__________ swim ___________ lend____________ learn____________ frget_____________ bring____________
was/were been
bught bught
spent spent
learned/learntlearned/learnt
frgt frgtten
brught brught
4a Read the sentences. Hw are fr and since used differently?
常与 fr 和 since 连用，强调动作的持续。
+ 时间点+ 时间段 + ag+ 一般过去时的句子
He has kept the bk fr 2 weeks.He has stayed here since 5 ’clck.He has stayed here since 5 hurs ag.She has taught English since she came here.
1. This cllege student enjys vlunteering fr the army. She ____________(teach) English t the sldiers ______________ three years.2. I _______________(be) a member f the Red Crss fr six years. I have made a lt f friends _______________ I jined the rganizatin.3. Mr Wu has taught in a primary schl as a vlunteer _______________ tw years nw. _______________ he started wrking there, he _______________ (help) many students.4. The rganizatin _____________(train) ver 6,000 vlunteers ________ it began t ffer classes three years ag.
4b Cmplete the sentences with the crrect frms f the verbs in brackets and fr r since.
has trained
“fr + 时间段” 表示持续一段时间，句子用现在完成时；主语“She” 是第三人称单数，所以“be” 用“has been”。
“fr six years” 是时间段，用现在完成时，主语“I”，“be” 用“have been”；“since + 一般过去时的句子” 表示“自从…… 以来”
“fr tw years” 表示持续两年，用现在完成时；“since + 一般过去时的句子” 引导时间状语从句，主句用现在完成时，主语“he” 是第三人称单数
“since + 一般过去时的句子” 引导时间状语从句，主句用现在完成时，主语“The rganizatin” 是第三人称单数，“train” 用“has trained”
I lve being a vlunteer! I _____________ (wrk) with a sprts rganizatin fr almst three years nw. Since I started, I  ____________ (help) ut at ver ten different sprts events. I _____________ (make) many new friends and I ___________ even ____________  (meet) many famus athletes. Fr example, I  ___________ (meet) tw natinal ftball players frm Argentina last mnth. They were at a stadium fr a charity match. The stadium ___________  (be) s big that they  __________  (get) lst. I gave them directins and they _____________ (smile)and  _________  (thank) me warmly. I am prud t be a vlunteer.
4c Cmplete the passage with the crrect frms f the verbs in brackets.
have helped
“fr almst three years nw” 表示从过去持续到现在的时间段，用现在完成时“have+过去分词”
“Since I started” 是现在完成时的标志，所以用“have helped”
因为是从过去到现在的经历，用现在完成时“have made”
“even” 表明到现在为止的经历，用现在完成时“have met”
“last mnth” 是一般过去时的标志，所以用“met”
描述过去体育场的状态，用一般过去时“was”
“gt lst” 是过去发生的动作，用一般过去时“gt”
表示过去的动作，用一般过去时“smiled”
表示过去的动作，用一般过去时“thanked”
4d Wrk in grups. Interview yur grupmates using the questins belw. Share the answers with the class.
everneveralready... yetsincefr……
Present yur interview. Reprt yur reprt in class.
HellMy partner... _____________________________________________. _____________________________________________. _____________________________________________. _____________________________________________.Lve __________________.
Check yur presentatin
Present yur reprt t the class.
Yu and me, we are vlunteers,we are changing the wrldbetter and better!
army意为 “军队”，常见搭配：jin the army 参军常见例句：He jined the army ten years ag.他十年前参军了。
1. This cllege student enjys vlunteering fr the army.
give directins 指路；thank sb.感谢某人warm(adj.)—warmly (adv.);warm up 热身；使暖和常见例句：He shk hands warmly with us.他热情地和我们握手。
2. I gave them directins and they smiled and thanked me warmly.
have been t 意为“曾经去过”，表示已经去过某个地方或参加过某个活动。 have gne t意为“已经去了”，表示某人已经离开或前往某个地方。 常见例句：I have been t Beijing three times. 我去过北京三次了。
3. Have yu been t ur animal shelter befre?
1. We haven’t seen each ther ______ 10 years.2. His father has been in the factry ______ 10 years ag.3. The film has been n ______ 20 minutes.4. Mr Green has wrked here ______ he came t China.5. His grandparents have been dead ______ 3 years.6. It’s five years _______ we met last time.
Fill in the blanks with “fr” r “since”.
用have been t, have gne t的恰当形式填空
1.—Where is yur brther? —He ____________ the shp. He’ll be back sn.2. — ______ yu ever _________ America? —Yes, I _____________ New Yrk twice.3. —Here yu are at last! Where _____ yu _____? —I _____________ Lndn.4. —David _______________ Australia. —I’m sure he’s already arrived.5. —Is Benny here? —N, he ___________ the schl library. He left five minutes ag.
Have been t
have been t
have been