英语中名词性从句中关系代词 副词用法

名词性从句中根本没有关系代词和关系副词.名词性从句中的引导词叫 连接词和连接代词和连接副词.连接词that ;if ;wtether 连接代词what ;who;which等 连接副词 when;where;how;why等宾从中 句子完整 意思完整 用 that 如 i think (that) he will be back.句子完整 意思不完整 用连接副词 或连接词 if （wtether)如 i want to know where you live.i want to know how you study english.i want to know if he will come tomorrow.句子不完整,缺主语 或宾语 或表语 用连接代词 如 tell me who is waiting for you 缺主语 故用who作主语 tell me who/whom you are waiting for.缺宾语 故用who/whom作宾语 tell me what this is.缺表语 故用what 作表语.