什么时候用主现从现 什么时候用主将从现 他们各有什么区别

1、主从现在起止时间状语从句和条件状语从句和让步状语从句，一般是将来时主句，从句用一般现在时一般将来时。

如：?When I grow up, I will be a nurse and look after patients/ I want to be a nurse and look after patients.

2、如果主句是祈使句，则从句用一般现在时。

如：Please let me know if he comes back.

3、现在时的主要感觉是，如果句子中有一个情态动词，那么情态动词在动词的一般现在时之后，即动词原形。

如：If you feel hungry ,you should eat something.

如果主句的时态是一般将来时，那么一般现在时应该使用

例如：I will tell him about it when he comes.

If it is fine tomorrow, we will go outing.

如果if的条件状语从句遇到变换间接和直接时 , 祈使句应用not....to....

如：Don't close the window if the rain stops, she said.

→She said?not to?close the window if the rain stops.

外出郊游:go on an outing 或者go out for playing或go outing

vocation 的意思:假期,暑假.vocation 和 holiday是同意词

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