含蓄虛擬條件句
含蓄條件句是指句中沒有明顯的虛擬條件句，而是利用其他手段來暗示存在虛擬條件。但是這類隱含式虛擬條件句往往都可以轉(zhuǎn)化為if引導(dǎo)的條件句。常來表示含蓄虛擬條件的手段有：
(1)介詞或介詞短語，如but for, but that, without, in case of, under more favorable condition等。
the leadership of the party, we could not be living a happy today.=If there hadn’t been the leadership of the party, we could not be living a happy today.
A. In spite of B. But for C. Because of D. As for 答案選B。
But that she was afraid, she would have said no.
(2)連詞，如：so that, unless, in case, supposing, lest, provided(倘若……)，for fear that(唯恐)，in order that, on condition that, if only(要是……就好了)等。
She listened carefully in order that she might discover exactly what he wanted.=if she listened carefully ,she might discover exactly what he wanted.
If only I had more money, I could buy a car.
(注：lest, for fear that 和 in case 引起的從句中謂語動詞多用should+動詞原形gydjdsj.org.cn，但可以不用虛擬語氣，而用動詞的陳述語氣形式。)例如：
The foreign teacher spoke slowly in case we misunderstood him. 這位外籍教師說得很慢以免我們聽不懂。
Care must be taken in using this method lest overflow should occur.在使用此法時要小心謹(jǐn)慎，以免會發(fā)生溢流現(xiàn)象。
(3)通過上下文及內(nèi)在含義，句中往往有but, otherwise, unfortunately等類似轉(zhuǎn)折詞。
I thought the children when we returned home, but they were still awake.
A. were sleeping B. would be sleeping C. had been sleeping D. would sleep選擇 B。
(4)形容詞及其比較級
A more careful person would not have made so many mistakes.
A less conscientious man wouldn’t have tried so hard to get this job done.
(5)分詞短語
Having known in time, we might have prevented the accident.
Born ten days earlier, the boy could have seen his late father.
