導語：定語從句that和what的區別是什麼?以下是小編爲大家整理的文章，歡迎閱讀!希望對大家有所幫助!
一、引導詞what與that在引導名詞性從句的用法區別引導主語、賓語或表語從句時，what在從句中要充當句子成分;而that引導主語、賓語、表語和同位語從句時，不作任何成分，只起語法連接作用。試比較：
That George W. Bush won the presidency once again was what many people hadn't expected.喬治?布什再次贏得總統大選，這是很多人沒有預料到的。
It is the same old story of not being grateful for what we have until we lose it.事情往往是這樣，失去之物，方知珍惜。
二、引導詞what與that在引導定語從句的用法區別首先，要記住在定語從句中，跟本不用what連接詞。只有that和which.所以大家在做題中，如果是定語從句，就不要再考慮what了。That 在定語從句中，一般可以作從句的主語。賓語和表語。例如：
1、(2005北京春季卷) Do you still remember the chicken farm ____ we visited three months ago?
where B when C that D what
「分析」C 定語從句連詞，that做從句visit的賓語。沒有what連詞。
2、He is not the naughty boy that he used to be.他不再是從前那個調皮的'男孩了。
鞏固性練習：從A、B、C、D四個選項中，選出可以填入空白處的最佳選項。
1. (2005福建卷) --Is that the small town you often refer to?
--Right， just the one _____ you know I used to work for years.
A that B which C where D what
2. ____ should be done must be done in time.
A What B All C Anything D All what
3. A computer is so useful a machine ______ we can use everywhere.
A that B which C as D what
4(2005天津卷)last month， part of Southeast Asia was struck by floods，from _____effects the people are still suffering.
A that B whose C those D what
5. (2005湖北卷) Her sister has becomes a lawyer， _____ she wanted to be.
A who B that C what D which
6. (07安徽) You can only be sure of _____ you have at present; you cannot be sure of something ____ you might get in the future.
A that; what B what;/ C which; that D /;that
7. (07陝西) _____ parents say and do has a life-long effect on their children.
A That B Which C What D as
8. (07上海) ____ he referred to in his article was unknown to the general readers.
A That B What C Whether D Where
9. (2006全國卷II)--What did your parents think about your decision?
----- They always let me do ____ I think I should.
A. when B that D. what
10. (2005上海卷)The other day，my brother drove his car down the street at ___ I thought was a dangerous speed.
A. as B which C. what D. that
1. C 定語從句，one是先行詞
2. A what引導主語從句，做從句中can的主語。這裏what=all that
3. C so……as……連用，屬於定語從句的範圍。
4. B 定語從句，whose從句effects的定語
5. D 非限定性定語從句，沒有that 和what.
6. B 第一空是of的賓語從句，從句中have缺少賓語，因此用what做連詞。第二空something後面是定語從句。
7. C 主語從句連詞 "父母的所作所爲對孩子有終身影響"
8. B主語從句連詞，從句中refer to缺少賓語
9. D 是do的賓語從句
10. D 是介詞at的賓語從句，at 做was 的主語。I think是插入語，可以忽略。
