爱华网Practice：Choose the correct answer
1. If there were no water in theworld, everything ______.
A. will dieB. would die
C. would have died D. havedied
2.If it _____ another ten minutes, the game would have been calledoff.
A. had rained B. would have rained
C. were to rain D. raine
3. If he _____ today, he would get there by Friday.
A. would leave B. was leaving
C. were to leave D. leaves
If引导的条件句(if clause)
（一）if 引导的非真实条件句(英语语法中又叫第二条件句-Secondconditional)
1. if引导的非真实条件句表示：
（1）虚拟的条件：
If there were no water in the world, everything woulddie.
(如果世界上没有水的话，一切生物都会死亡）
（2）与现在的事实相反：
If I had money, I would buy a plane.(要是我有钱的话，我就会买架飞机）
2. 结构：
If引导的非真实条件句有两部分组成：主句 和 从句
If 引导的句子做从句，另外的句子是主句。
位置：If引导的句子可以放在句首，也可以放在主句后。
翻译：如果我有足够的前，我就买那套房子。
eg. If I had enough money, I'd buy that apartment.
I'd buy that apartment if I had enough money.
注：If引导的句子如果放在句首，在主句前要加逗号。如果放在主句后的话就不必加逗号了。
3.非真实条件句 主句和从句的时态和结构：
（1）If she were rich,she would move to Caribbean.
If I had some free time, Iwould go with you.
if从句用一般过去式， 主句用过去将来时。
if+ ...were/ did ....,....would/could + do....
(2) If it had rained another ten minutes, thegame would have been called for stop.
if从句用过去完成时， 主句用过去将来完成时。
if + ...had done...,.....would/couldhave done.....
(3) If I could plan to do anything I wanted to, I’d like to go toTibet.
If... could do...., .... would do......
(4)If he were to leave today, he would get there by Friday.
If .... were to do....., ...... woulddo......
注：主句中的would经常缩写为'd
4.错综时间条件句
非真实条件句中，如果主句的时间和从句的时间不一致，那么主句和从句应该用什么时态和结构？
Example
If you ______ hard yesterday, you ____ tired now.
A. had worked; would be B. would have worked; were
C. have worked; were D. worked; had been
总结:当从句与主句所表示的时间不一致时,主句和从句的动词形式决定于要表示的具体时间。此题答案选AIf+... had done..., ....woulddo...
Practice:
a.If it ___________ (rain) last night, you __________(feel) verycold today
b.If you _____________ (not watch) that late movie last night, you___________ (not be) so
