<例句>
Can it be true?
這可能是真的嗎?
<語(yǔ)法分析>
情態(tài)動(dòng)詞和原形動(dòng)詞連用可以表示對(duì)現(xiàn)在情況的推測(cè),情態(tài)動(dòng)詞和現(xiàn)在完成時(shí)態(tài)連用表示對(duì)過(guò)去情況的推測(cè)。can可以用于肯定句、否定句和疑問(wèn)句中,may也可用在肯定句和否定句中,但不用在疑問(wèn)句里。must和have to只用在肯定句里。should (could, might, ought to) + 過(guò)去分詞,可表示“原本......而未......”的意思。
<觸類旁通>
(1) It cannot have been lost in the post.
它不可能落在郵筒里。
語(yǔ)法分析:can和現(xiàn)在完成時(shí)態(tài)連用,表示對(duì)過(guò)去情況的推測(cè)。
(2) She cannot be his wife.
她不可能是他的妻子。
語(yǔ)法分析:情態(tài)動(dòng)詞和原形動(dòng)詞連用可以表示對(duì)現(xiàn)在情況的推測(cè)。
(3) That may be so, but I doubt it.
事情可能就是這樣,但我對(duì)此表示懷疑。
語(yǔ)法分析:may用在肯定句和否定句里,但不用在疑問(wèn)句里。
(4) He must be in.
他一定在家。
語(yǔ)法分析:must 只用在肯定句里。
(5) I should have gone there alone.
我本該一個(gè)人到那里。
語(yǔ)法分析:should或could might ought to + 過(guò)去分詞,表示“原本......而未......”的意思。
<鞏固練習(xí)>
1. She could not _____[see] me yesterday because I wasn't there.
2. Could he _____[hear] of her?
3. It may _____[be] your mistake.
4. English may ____[hard], but it's so useful.
5. She may _____[go] somewhere else.
6. She might not ____[mad].
7. She must _____[read] in the reading-room.
8. They should _____[arrive] there by this time.
9. You might _____[complete] the work earlier.
10. You ought to _____[give] me something to eat then.
<參考答案>
1. have seen 2. have heared 3. have been 4. be hard 5. have gone 6. be mad 7. be reading 8. have arrived 9. have completed 10. have given