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1. IF-从句中的动词用一般现在时态,主句中的动词用一般将来时态.主句和从句的位置可以互换:
eg. If he is out , I’ll call tomorrow.
改错：
If he will have time,he will come.
If he has time, he will come.
He will get there in time if he will runs.
He’ll get there in time if he runs.
2.如果要用从句表达将来的意思,也只能用一 般现在时态的形式来表达,而绝不能用将来时 的形式:
eg. If it rains tomorrow, I will stay at home.
改错:
If he will have enough money next year, he’ll go to Europe.
If he has enough money next year, he,ll go to Europe
3.主句的变化形式:
a) IF-从句中的动词是现在时,主句中shall/will可以用其它情态动词代替:
Eg:If it rains,we can/must/may stay at home.
If it stops raining we can/may go out.
If you want to lose weight,you must eat less bread.
4. IF-从句的变化:
从句中可以用现在进行时,表示现在的行为或将来的安排:
If you are leaving tomorrow,I’ll send you a car.
If you are looking for Peter,you’ll find him in the library.
