# 宾语从句宾语从句：* I don't know what to do. * I don't know which one is the best.* 象这种有what, which, that引导句子在整个句子, 充当宾语成分.那就是宾语从句.* 主语：I * 谓语：don't know * 宾语：what to do.区别于 定语从句：* I don't know the man who is wearing a pair of glass.* 象这中由who, which, that, when 引导的句子在整个句子中做定语成分就叫定语从句.* 主语：i* 谓语：don't know* 宾语：the man* 定语：who is wearing a pair of glass.修饰the man.