It 's too difficult for him to master English in such a short time.

他在这么短的时间内掌握英语太难了。

youdao

It 's too difficult a problem for him.

对他来说，这是一个太难的问题。

youdao

It 's too difficult a problem for him.

对他来说，这是一个太难的问题。

youdao