复合句是指带有因果,转折,假设,条件等语气的句子,一般由复合连词引导（because,so,if ,but,although,though.） 例：If it rains tomorrow,our plan will be cancelled. 如果明天下雨,我们的计划就得取消. 下面这个句子是带有宾语从句的复合句: Although I don"t know where he is,the police ask me to stay at the room. (where he is 是宾语从句）
