if所引导的条件状语从句有哪些时态，需要注意什么？怎样学好？？

Question

如题所述

Answer 1

条件状语从句：引导词有 if, unless, as long as

时态关系： 主句 从句

一般将来时 ↘

带情态动词的一般现在时→ 一般现在时

祈使句 ↗

I’ll tell him if he comes.==If he comes,
I’ll tell him.

You won’t suvveed unless you work hard.

As long as we don’t lose heart, we will
find a way.

Put on your coat if you feel cold.

过去将来时 + 一般过去时

① 宾语从句中 He said he would come back if
he finished the work.

② 表示虚拟 We would do it better if he came.

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