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Unit 13 The water planet教學(xué)設(shè)計(jì)

發(fā)布時(shí)間:2017-04-03

Unit 13 The water planet教學(xué)設(shè)計(jì)


if that is the case, we may as well try.如果情況確實(shí)如此,我們不妨試一試。
典型例題
  peter ___come with us tonight, but he isn't very sure yet.
 a. must b. may  c. can  d. will
答案b. 表可能性只能用may。此句意可從后半句推出。
4 比較have to和must 
1) 兩詞都是'必須'的意思,have to 表示客觀的需要,must 表示說(shuō)話人主觀上的看法,既主觀上的必要。例如:
my brother was very ill, so i had to call the doctor in the middle of the night. 
弟弟病得很厲害,我只得半夜里把醫(yī)生請(qǐng)來(lái)。(客觀上需要做這件事)
 he said that they must work hard. 他說(shuō)他們必須努力工作。(主觀上要做這件事)
2)have to有人稱(chēng)、數(shù)、時(shí)態(tài)的變化,而must只有一種形式。但must 可用于間接引語(yǔ)中表示過(guò)去的必要或義務(wù)。例如:
he had to look after his sister yesterday. 他昨晚只得照顧他姐姐。
3) 否定結(jié)構(gòu)中:don't have to表示"不必",mustn't表示"禁止"。例如:
 you don't have to tell him about it.你不一定要把此事告訴他。
 you mustn't tell him about it.你不得把這件事告訴他。
5 must表示推測(cè)
1) must用在肯定句中表示較有把握的推測(cè),意為"一定"。
2) must表對(duì)現(xiàn)在的狀態(tài)或現(xiàn)在正發(fā)生的事情的推測(cè)時(shí),must 后面通常接系動(dòng)詞be 的原形或行為動(dòng)詞的進(jìn)行式。例如:
  you have worked hard all day. you must be tired. 你辛苦干一整天,一定累了。(對(duì)現(xiàn)在情況的推測(cè)判斷)
  he must be working in his office. 他一定在辦公室工作呢。
比較:he must be staying there. 他現(xiàn)在肯定在那里。
he must stay there. 他必須呆在那。
3) must 表示對(duì)已發(fā)生的事情的推測(cè)時(shí),must 要接完成式。例如:
   i didn't hear the phone. i must have been asleep.我剛才沒(méi)有聽(tīng)到電話,我想必是睡著了。
4) must表示對(duì)過(guò)去某時(shí)正發(fā)生的事情的推測(cè),must 后面要接不定式的完成進(jìn)行式。例如:
 ---why didn't you answer my phone call? 為何不接我的電話?
 ---well, i must have been sleeping, so i didn't hear it.唉,肯定在睡覺(jué),所以沒(méi)有聽(tīng)見(jiàn)。
5) 否定推測(cè)用can't。例如:
  if tom didn't leave here until five o'clock, he can't be home yet.
6 表示推測(cè)的用法
    can, could, may, might, must 皆可表示推測(cè),其用法如下:
1)情態(tài)動(dòng)詞+動(dòng)詞原形,表示對(duì)現(xiàn)在或?qū)?lái)的情況的推測(cè),此時(shí)動(dòng)詞通常為系動(dòng)詞。例如:
  i don't know where she is, she may be in wuhan. 我不知道她在哪兒,可能在武漢。
2)情態(tài)動(dòng)詞+動(dòng)詞現(xiàn)在進(jìn)行時(shí),表示對(duì)現(xiàn)在或?qū)?lái)正在進(jìn)行的情況進(jìn)行推測(cè)。例如:
  at this moment, our teacher must be correcting our exam papers. 這時(shí),想必我們老師正在批改試卷。
3)情態(tài)動(dòng)詞+動(dòng)詞完成時(shí),表示對(duì)過(guò)去情況的推測(cè)。例如:
  the road is wet. it must have rained last night. 地是濕的,昨天晚上一定下雨了。
4)情態(tài)動(dòng)詞+動(dòng)詞的現(xiàn)在完成進(jìn)行時(shí),表示對(duì)過(guò)去正在發(fā)生事情的推測(cè)。例如:
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