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1) 對(duì)現(xiàn)在情況的推測(cè)，問(wèn)句部分用主動(dòng)詞(do,be)一般現(xiàn)在時(shí)的適當(dāng)形式。若是現(xiàn)在進(jìn)行時(shí)，問(wèn)句部分用現(xiàn)在進(jìn)行時(shí)的適當(dāng)形式表示。若是there be結(jié)構(gòu)，問(wèn)句用isn't/aren't there。如：

a. He must be there,isn't he?

b. He must have a big family,doesn't he?

c. He must be waiting outside,isn't he?

d. There must be some students in the room,aren't there?

2) 對(duì)已發(fā)生的過(guò)去情況的推測(cè)，若陳述句謂語(yǔ)部分有“must have done”，而且有表示過(guò)去的時(shí)間狀語(yǔ)，問(wèn)句部分用didn't;若沒(méi)有表示過(guò)去的時(shí)間狀語(yǔ)，問(wèn)句部分用haven't或hasn't。如：

a. They must have gone there last night,didn't they?

b. They must have arrived by now,haven't they?(根據(jù)by now來(lái)判斷)

c. They must have been to the Great Wall,haven't they?

3) 若是被動(dòng)，應(yīng)按被動(dòng)結(jié)構(gòu)來(lái)處理。如：

a. The room must have been cleaned yesterday,wasn't it?

b. The room must have been cleaned,hasn't it?

4) 若句中有表示過(guò)去完成時(shí)的時(shí)間狀語(yǔ)，問(wèn)句部分應(yīng)用hadn't. 如:

They must have learnt 5000 English words by the end of last term,hadn't they?

(本題中must表推測(cè)，如果將它去掉，還原為真實(shí)句就是They had learnt 5000 English words by the end of last term.因此，反意問(wèn)句是hadn't)

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