Remember to turn off the light when you leave. 再问: You believe what he did .You're really foolish. 这个你会不会转换 再答: don't believe what he did.you are really foolish.这是单个的两个句子。 you are really foolish that you believe what he said.这就是一个带宾语从句的复合句 you are really foolish to believe what he said .这也是一个简单句。