Han Hong will give a concert in our city.I don’t know.合并为含有宾语从句的复合句

问题描述:

Han Hong will give a concert in our city.I don’t know.合并为含有宾语从句的复合句

I don’t know that Han Hong will give a concert in our city.

I don’t know that Han Hong will give a concert in our city, 应该就是这样的··

I don't know that Han Hong wil give a concert in our city.

i don't know if Han Hong will give a concert in our city.
要用 if