I know (that) he is a good person.
I know when we should go.
I know whether I should tell him the truth.
I know if I should tell him the truth.
I know that you believe you understand what you think I said,but I’m not sure you realize that what you heard is
not what I meant.
I find the best way to concentrate is to make notes on what the readers are saying.
I will give this dictionary to whoever wants to have it.
1)whether…or not 结构不能用if替换
Everything depends on whether you agree with us. 一切取决于你是否同意我们。
The teacher told the children that the sun is round. 老师告诉学生太阳是圆的。（客观事实，不变）
I believe that out team will win the basketball match. (主句一般现在时，不变）
In the bookshop,a reader asked the shopkeeper if Who Moved My Cheese was an interesting book.
Catherine said that she had never been to Guangzhou.
Do you know what Tom will do during the coming holiday?(主语从句语序)