主将从现怎么用在什么情况下?
如果主句是将来时或表示将来含义时，那么条件和时间状语从句多用一般现在时。如果主句是祈使句，那么从句通常要用一般现在时。如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时。如果主句的时态是过去将来时，那么从句要用一般过去时。
所谓的“主将从现”，就是“主句用将来时态，从句用现在时态”这样的一种语言现象。
主句的将来时态，并不是局限于“将来一般时态”；从句的现在时态，也并不是局限于“现在一般时态”。
例句：
1. If it rains we'll get wet.
如果下雨，我们会淋湿的。
2. When he comes，I will tell him about it.
他一来，我就告诉他。
以上例句中的从句都采用了“现在时态”，主句都采用了“将来时态”，这就是英语中的“主将从现”现象。
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