如果没有电，今天的生活就会完全不同。

　　But for your help (＝ If it had not been your help), it would have caused a serious loss.

　　要不是你的帮助，那将会导致巨大的损失。

　　A true friend would not do such a thing. (＝ If he were a true friend, he would not do such a thing.)

　　一个真正的朋友是不会做这样的事的。

　　3．含虚拟语气的句子：but＋真实情况

　　Mary would tell us something about London, but she isn't from London.

　　玛丽很想告诉我们一些关于伦敦的事情，但她不是来自伦敦的。(前面表示对现在的虚拟，but后的从句表示一个客观情况)

　　[即时演练3]　用所给动词的适当形式填空

　　①(2017·天津高考改编)-Do you have Betty's phone number?

　　-Yes.Otherwise, I wouldn't_have_been (be) able to reach her yesterday.

　　②(2015·安徽高考改编)It is lucky we booked a room, or we would_have (have) nowhere to stay now.

　　③(2015·重庆高考改编)Without his wartime experiences, Hemingway wouldn't_have_written (not，write) his famous novel A Farewell to Arms.

　　④(福建高考改编)Were (be) there no modern telecommunications, we would have to wait for weeks to get news from around the world.

　　⑤(福建高考改编)-Pity you missed the lecture on nuclear pollution.

　　-I would_have_attended (attend) it, but I was busy preparing for a job interview.

　　Ⅰ.用所给动词的适当形式填空

　　1．(2017·江苏高考改编)Were (be) it not for the support of the teachers, the student could not overcome her difficulty.

　　2．If it had_rained (rain) last night, the ground would be wet now.

　　3．If she had got financial aid, she would_graduate (graduate) from a college this fall.

4．We lost our way in that small village, otherwise we would_have_visited (visit) more places of interest.