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从句或者接不定式的一般形式；
或者用一般过去时态后面接不定式的完成形式表示过去未曾实现的愿望
例：She had supposed him to be very rich. 她原以为他很有钱。
(5) wish that ?had done sth.表示过去未曾实现的愿望．
例：I wish he had been here yesterday. 要是他昨天在这儿就好了。 (6) 情态动词should ,would, could, might, ought to等后接不定式的完成时， 表示过去本该做，打算做，想做而未做的事情．
should have done =ought to have done 本应该做而没做
would have done = 本来就会去做某事而没做
could have done = 本可以做某事而没做
might have done 本可以做而没做 例：They ought to have apologized. 他们本该道歉的。
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47、倍数句型：
(1)倍数＋比较级＋than．．．， 例：The room is twice larger than that one．这个房间是那个房间的两倍大。
There is 30 times greater chance of being hit by lightening than being attacked by a shark.
(2)倍数＋as＋原级＋as．．．，
例：The room is three times as large as that one．
这个房间是那个房间的三倍。
(3)倍数＋the size ／height／length ／weight ／width of．．．
例：The room is three times the size of that one．
这个房间是那个房间的3倍大。
48、比较句型： (1)原级比较： 例：English is not so difficult a subject as Russia.
英语不是和像俄语一样难的科目。
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