句型转换和,根据汉语提示完成句子
问题描述：
句型转换和,根据汉语提示完成句子
The problem is very difficult.We can't work it out.(改为两个简单句,两个复合句）
The problem is____ _______ ____ _____to work out.
The problem isn't______ _______ _____ _____ to work out.
The problem is _____ ________ _____we can't work it out.
This is ______a difficult problem_______we can't work it out.
答
The problem is too difficult for us to work out.
The problem isn't that easy for us to work out.
The problem is so difficult that we can't work it out.
This is such a difficult problem that we can't work it out.