牛津譯林版八年級(jí)英語上冊(cè)《Wild animals》PPT課件(第4課時(shí)),共16頁。
May I help you sir?
一、情態(tài)動(dòng)詞may的用法
1. 用情態(tài)動(dòng)詞may 表示肯定推測(cè),譯為“可能,也許”,通常只用于肯定句與否定句中,相當(dāng)于perhaps, possibly 或maybe。
may not :可能不,表示否定推測(cè)
eg:The news may or may not be true.
這消息也許是真的,也許不是真的.
2. may 除了可以表示推測(cè),還可以表示請(qǐng)求,許可,允許,通常用于疑問句中。
eg:—May I go now? 我現(xiàn)在可以走了嗎?
—Yes, you can. / No, you can't.
回答時(shí)不可用may, might,或could及其否定形式
3. 表示必須,必要。must 和have to
在陳述句中,must強(qiáng)調(diào)說話者的主觀想法, have to強(qiáng)調(diào)客觀需要,意為“不得不”。
在疑問句中,回答must引出的問句時(shí),肯定回答用must, 否定回答可以用needn't或don't have to(不必),一定不能使用mustn't(禁止,不準(zhǔn))。
eg:—Must I finish my homework now ?
我現(xiàn)在一定要完成作業(yè)嗎?
—Yes, you must. / No, you needn't/don't have to.
是的,一定要。/不,沒必要。
二、動(dòng)詞不定式結(jié)構(gòu)
1. eg:Linda wanted to visit the park.
Sandy needs to go with them.
Millie decided to stay at home.
上面例子中主要行為動(dòng)詞后面的動(dòng)詞都采用了“to + 動(dòng)詞原形”的結(jié)構(gòu),我們把這種結(jié)構(gòu)稱為動(dòng)詞不定式(有時(shí)可以不帶to)。動(dòng)詞不定式?jīng)]有人稱和數(shù)的變化,在句子中不能單獨(dú)作謂語。
2. 也有一些動(dòng)詞后面可以跟動(dòng)名詞結(jié)構(gòu)doing sth. , 但是 意義不同。
forget to do sth. 忘記去做某事(事情未做)
eg:Don't forget to lock the door when you go out.
當(dāng)你出去時(shí)別忘了鎖門。
forget doing sth. 忘記做過某事(事情已做)
eg:I forgot washing hands and washed again.
我忘了已經(jīng)洗過手了,又洗了一遍。
課堂練習(xí)
用所給詞的適當(dāng)形式完成句子
1.—Must I finish my homework now?
—No, you needn't. You may ________ (finish) it this afternoon.
2.She agreed_________(let) me go early.
3.The students prepare _________ (play) football after class this afternoon.
4.She planned __________ (visit) our city this summer.
5.Why did you choose _________(sit) in the front of the coach?
6.I want ________ (go) to the library this afternoon.
7.We hope __________(arrive) around six.
8.It's raining hard so I decide ___________ (not go) out.
9.The policeman told the children _____________ (not play) football in the street.
10.Please ask him _____________ (not watch) TV until he finishes his homework.
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