主语从句是详细地说明主语的,而宾语从句是描述宾语的 It's important (that we should work hard). it是形式主语,真正的主语是that及以后的从句 (What I want to know ) is your grammar. 这一句is以前的是主语从句. He said (that he could go with me ). 括起来的就是作said的宾语 还有就是whether ,if ,what ,which ,who ,whom ,when, where, how, why 这些都能引导宾语从句 要注意的就是从句都是陈述句语序