先理清句子的成分，把从句部分先用括号括起来。看句子的主干是哪种情况 1、只有主语+谓语动词 缺少宾语，那么整个从句充当句子宾语，称为宾语从句。（从句前面是一个动词） 2、主谓宾完整，整个从句作为定语补充说明宾语这个先行词，称为定语从句。（从句前面是一个名词）分别举个例子：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. 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. 状语从句： i don't know she is my english teacher when i see her at first time.我第一眼见到她的时候,不知道她是我的英语老师. 象这样以when引导的句子在整个句子中充当状语成分的就是状语从句. 主语：i 谓语：don;t know 宾语：she is my english teacher. 状语：when 引导的句子.
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