楼主,您好一、连词分类：1．并列连词：是指连接对等的词、词组和句子,而不是连接主句与从句的连词,如：and,both…and,neither…nor,notonly…butalso,aswellas,but,however,while(而),still,yet,or,either…or,otherwise,so,for,therefore,thus,accordingly,consequently,hence,then,等.2．从属连词：指连接主句与从句的连词,如：that,whether,if,before,after,as,assoonas,once,since,eversince,till,until,when,whenever,while,because,since,nowthat(既然),so…that,such…that,sothat,inorderthat,asif,asthough,though,although,eventhough,evenifnomatterwho/whoever/…,unless,as/solongas,incase(以防),lest(惟恐),provided,providing,（如果）supposed,supposing,（假使）等.二、代词的分类1.关系代词a)有who,whom,whose,as,that和which,是用来引起定语从句的.who,whom代表人,在从句中作主语时用who,作宾语时用whom：Thereisagirlwhowantstoseeyou.有一个姑娘想见你.Heisthemanwhomyouaskedtosee.他就是你要求见的人.whose表示“他(她)的”,在从句中作定语：Doyouknowthegirlwhosepaintingwonthefirstprize?你认识那个作品赢得头奖的姑娘吗?这些关系代词,一方面引起定语从句,修饰前面的那个名词,一方面在从句中担任一个成分.(who作主语,whom作宾语,whose作定语.)b)which代表事物,在从句中可以作主语或宾语：还可以代替整个句子；Hetoldusastorywhichwasveryinteresting.他给我们讲了一个非常有趣的故事.ThisisthebookwhichIbought.这就是我买的那本书.that也可代表事物,在从句中作宾语：Haveyougoteverythingthatyouneed?你需要的东西都有吗?在从句中作宾语的关系代词,有时可以省略：That’sthebookIbought.这就是我买的书.Heisalwayslateforschool,whichmakeshisteacherveryangry.c)关系代词as:Asisknowntoall,theearthisround.Theearthisround,asisknowntoall.关于关系代词详见定语从句.2.连接代词指引起从句的疑问代词,可用用来引起主语从句(a)、宾语从句(b)和表语从句(c)：a.Whoistobesenttherehasn’tbeendecided.派谁去还没决定.b.Idon’tknowwhodidit.我不知道这是谁干的.c.Thequestioniswhatweshoulddonext.问题是下一步我们该怎么办.what可有特殊意义,表示thethingwhich(…的东西),可作主语(a)、宾语(b)和表语(c)：a.Whatyouneedismorepractice.你需要的是更多练习.b.Showmewhatyoubought.把你买的东西给我看看.c.That’swhatIheard.这是我听到的情况.这可以称作关系代词型的what.希望能帮到您,