You should write him a letter的同义句

Question

=You _ _ _ Write him a letter.怎么填？？？

Answer 1

are supposed to(这是空缺部分)

Answer 2

为你解答。
You should write him a letter的同义句
You should write a letter to him.
你应该给他写封信。
解释：write sb a letter=write a letter to sb.追问

=You _ _ _ Write him a letter.怎么填？？？

追答

You （have got to） write him a letter.

你得给他写封信。

Answer 3

ought to解释为应该追问

不是，填空。

追答

不是填ought to吗

追问

=You _ _ _ Write him a letter.怎么填？？？

追答

就是填这个啊

追问

是3个空！！！

追答

are supposed to或者are meant to解释为应该