一：关系代词as引导的定语从句：
1）as引导的限制性定语从句，一般先行词前有such，thesame修饰，
构成such+名词as……
thesame+名词+as….
as可以充当主语，宾语或表语,;1.?Heisnotthesamemanashewas.
2.?SuchgirlsasheknowsaregoodatEnglish.
3.Wehavefoundsuchmaterialsasareusedintheirfactory.
thesame+名词+as……..
thesame+名词+that……;.Allthepeopleshouldmeetatthesamehall___wontheprize.
Who
.I’mlookingforsuchaplace___Ifoundmylostsister.
Where
.Heissogoodateacher___weallrespect.
As
.Heissogoodateacher__weallrespecthim.
that
;3)as引导的非限制性定语从句，位置灵活，可位于句首，句中，句尾，as“正如，正像“
Aseveryoneknows,Chinaisabeautifulcountrywithalonghistory.
正如每个人都知道，中国是一个有着悠久历史的美丽国家。
?Theearth,asweknow,movesroundthesun.地球，我们都知道，围着太阳转。
Tomworkshardandiswillingtohelpothers,asweallknow.汤母工作努力，并且乐于助人，这一点我们都知道。;常见的as引导的非限制定语从句
asweallknow
asisknown
aseveryknows
aswe(had)expected
asismentionedabove;注意：
as引导的非限制性定语从句与which引导的非限制性定语从句异同：
1）都可指代整个句子，但as从句位置灵活，可位于句首，句中，句尾，”正如正像”
2）which引导的从句只位于主句之后，意为“这一点”,主从句一般是因果关系
_____isknown,theearthisround.
Shewaslateagain,______madetheteacherangry.;;;Theman,whohasthreechildren,ismyuncle.
那个人，有三个孩子，是我的叔叔。
Themanwhohasthreechildrenismyuncle.
那有三个孩子的人是我的叔叔。
Shewaslateagain,whichmadetheteacherupset.;Thevase,whosepriceisalittlehigh,isvaluable.
Thegirl,towhomItalkedjustnow,wasthemanagerofthatcompany.
Thefactory,whereIworked,belongedtoJapan.
Thewar,when/duringwhichChinesefoughtagainstJapanese,last(持续）eightyears.;1.Sheheardaterriblenoise,_______broughtherheartintohermouth.
a.itb.whichc.this??d.that
2.Theweatherturnedouttobeverygood,____wasmorethanwecouldexpect.
a.whatb.which??????c.that??d.it;3.CarolsaidtheworkwouldbedonebyOctober,＿＿＿＿＿personallyIdoubt?very??much.
??a.it????b.that???c.when??d.whic