if英语用法总结（英语if引导的句子）

If引导的句子◎If引导的条件状语从句，从句用一般现在时态，主句用将来时态，今天小编就来说说关于if英语用法总结?下面更多详细答案一起来看看吧!

if英语用法总结

If引导的句子

◎If引导的条件状语从句，从句用一般现在时态，主句用将来时态

If it is fine tomorrow I will go to the park.

◎if 引导的虚拟语气

1.与现在事实相反：从句用过去时态（be动词一律用were）主句用would 动词原形

If you knew everything,you would not be so angry with him.

If i were you I would not be confident

2.与过去事实相反：从句用过去完成时，主句用would 现在完成时

If I had known his telephone number,I would have telephoned him

练习

1.if a train entered this tunnel,it (draw)in fresh air behind it

2.if you had told me about it earlier,I (be able)to help you

3.if you (come)with us ,we would have been pleased

4.you (not make) such a mistake if you had been more careful

5.if father (be) alive,he would be horrified

6. If it (not rain )tomorrow，we will go there by bike.

7. If it is fine tomorrow ,I ( go) to the park.