把It is clever of you to solve this problem.改成由that引导的主语从句怎么做啊?还有这两句也是改成由that引导的主语从句：1.It is foolish of him to go alone.2.It is difficult for us to master a foreign language.
问题描述：
把It is clever of you to solve this problem.改成由that引导的主语从句怎么做啊?
还有这两句也是改成由that引导的主语从句：1.It is foolish of him to go alone.2.It is difficult for us to master a foreign language.
答
It is clever of you to solve this problem.
===it is very clever of you that you solve this problem
=== That you solve this problem is very clever of you .
1.It is foolish of him to go alone.=== that he goes alone is foolish
2.It is difficult for us to master a foreign language.===that we master a foreign language is difficult.