问题补充:
I don’t know if Mr Wang here tomorrow . If he , please tell me.
A. comes , comes
B. will come ,comes
C. comes , will come
D. will come ,will come
答案:
A. comes , comes
(答案→)B. will come ,comes
C. comes , will come
D. will come ,will come
解析:if既可以引导宾语从句又可以引导状语从句。if充当宾语从句的连接词时,相当于whether,词义为“是否”,遵循宾语从句的时态规则,可根据语境选择任何时态;充当从属连词,引导条件状语从句时,词义为“如果”,若主句中的谓语动词用一般将来时,则从句中的谓语动词通常用一般现在时表示将来。