人教版 (2019)必修 第三册Unit 5 The Value of Money多媒体教学ppt课件

这是一份人教版 (2019)必修 第三册Unit 5 The Value of Money多媒体教学ppt课件，共18页。PPT课件主要包含了强调说话人的主观看法，语法填空，考点追击，to look，had，情态动词表可能和猜测，语法精讲，must，cancould，maymight等内容，欢迎下载使用。
1. must可用来表义务，翻译为“必须”。
例：I dn’t like this TV set. We must buy a new ne. He must wrk hard t achieve his gals.
2. have t可用来表义务，翻译为“不得不”。强调客观需要，并且能用于多种时态。
例：I’m very tired and I have t stp t rest fr a while. He had t stay in bed because f his illness.
3. shall用于条约，规定，规章等文件中。表示一种义务，多用于第三人称中。
例：It’s required in ur regulatin that students shall g t schl n time. Students shall remain in the seats until all the papers have been cllected.
4. shuld表示“应该、必须”，通常表示自己的主观看法。
例：The bys shuldn’t be playing ftball. They shuld be at schl. We shuld prtect ur envirnment.
ught t表示义务，重于反映客观情况或涉及义务和规定，语气较shuld强。
例：Yu ught t take care f the baby. Yu ught t be earning yur living at yur age.
1. My mther brings me up and takes gd care f me, s when she is ld I ught (lk) after her in return.
解析：ught t表示义务，重于反映客观情况或涉及义务和规定。
2. There was n mre bus. They (have) t walk hme.
解析：have t可用来表义务能用于多种时态。根据语境句子用一般过去时。
情态动词中的must, can, culd, may, might，will，wuld，shuld，ught t都表可能与猜测。
1. 肯定句中一般用must (一定)，may (可能)，might / culd (也许，或许)表可能和猜测。
例： Yu’re Tm’s gd friend, s yu must knw what he likes best. Yur mther may/might knw the truth.
例：It can’t/culdn’t be the headmaster. He has gne t America. He may nt/might nt knw the scientist.
2. 否定句中用can’t / culdn’t(不可能)，may nt/might nt(可能不)表可能和猜测。
3. 疑问句中用can/culd (能……?)表示可能和猜测。
例：Culd he have finished the task? Can he be at hme at present?
例：1.The cluds are gathering. I’m afraid it might be puring dwn sn. 2. The plane culd be delayed by fg tday. 
may和can的过去式？
表示语气更加委婉或可能性较小
4. shuld/ught t表可能和猜测时，意为“想必会，理应……” 。
例：It’s seven ’clck. Jack ught t/shuld be here at any mment. There shuldn’t be any difficulty abut getting yu a visa.
1. Peter may cme with us last night, but he wasn’t very sure then.
解析：may和might都可以表示可能和猜测，句子为过去时，要用过去式might。
2. It mustn’t be his father. He has gne abrad.
解析：mustn’t表示“禁止”，can’t表示“不可能”。