若虚拟条件句为否定句，否定词not不提前。

　　Had I not been ill that day，I would have taken part in the parade.

　　如果那天没生病，我会去参加集会的。

　　[即时训练2]　句型转换

　　①If I were at school again，I would study harder.

　　→Were I at school again，I would study harder.

　　②If you had come earlier，you would catch the bus.

　　→Had you come earlier，you would catch the bus.

　　③If he had come here yesterday，he would have seen his old friend.

　　→Had he come here yesterday，he would have seen his old friend.

　　[名师点津]　

　　If it weren't for.../If it hadn't been for...相当于but for...，意为"多亏了......，要不是......"。

　　If it hadn't been for your advice，I should have failed.

　　＝But for your advice，I should have failed.

　　要不是你的忠告，我会失败的。

　　Ⅰ.单句语法填空

　　1．If she had been at school，I would have seen (see) her.

　　2．I would let (let) you go to work now if it weren't raining so hard.

　　3．Had (have) it not been for the free ticket，I would not have gone to see the film.

　　4．If I had had her phone number，I would have got (get) in touch with her.

　　5．Were (be) I you，I would buy a new car.

　　6．If it were to rain/should rain/rained (rain) tomorrow，the meeting would be put off.

　　7．If I was/were (be) in charge，I'd do things differently.

8．Would she tell us the truth if we asked (ask) her?