宾从句型

1、主句+whether（if）+从句

I don't konw whether/if he'll arrive in time.

2、主句（现在/将来）+从句（任一时态）

主句（过去）+从句（过去相应时态）

I konw you didn't konw what I think at all.

He asked me if I was reading the novel The Old Man and the Sea when he came in.

3、主句+从句(一般现在）从句表客观事实或真理

My mother told me that a friend in need is a friend indeed.