是不是所有的主语从句都可以改成It is...that

题目

是不是所有的主语从句都可以改成It is...that
例如：Whether we will go for an outing tomrrow remains unknow.
Who will be our monitor has't been decided yet.
Whom we must study for is a question of great importance.
What caused the accident remains unknown.
Whatever you did is right.
Whose watch was lost is unknown.
请帮以上句子进行IT is...that...的改写,

答案

It is unknown whether we will go for an outing tomorrow.It hasn't been decided yet who will be our monitor.It is a question of great importance whom we must stuey for.It is unknown what caused the acc...