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if引导从句的三种时态讲解 有关if引导从句的三种时态讲解
2022-08-30 08:24:28  浏览:55

if引导从句的三种时态讲解 有关if引导从句的三种时态讲解

1、主将从现(主句为一般将来时,从句为一般现在时);

eg:If it rains(从句) ,I will stay at home(主句).

=I will stay at home if it rains.

2、主句含有情态动词 (must、may、can etc.)从句为一般现在时;

eg:If you drive too fast ,you may have an accident.

=You may have an accident if you drive too fast

3、主句为祈使句,从句要用一般现在时态;

eg:Dont play computer games if you dont finish your homework.