高中英语-语法专题-名词性从句.pptx

语法专题

名词性从句;

名词性从句相当于名词，可分别作句子的主语、表语、宾语和同位语。

;名词性从句的连接词

名词性从句的连接词是名词性从句中最核心的问题，也是高考的常考点。连接词的选择要考虑它在从句中的作用和所表达的意义。;;;;;2whether引导主语从句时既可以放在句首，也可以放在句尾，但if引导的主语从句只能放在句尾，前面需用it作形式主语。Whether,if只连接作用，在句中不作成分。

Whetherwewillgopicnickingtomorrowdependsontheweather.

Itisnotimportantwhether/iftheyhaveenoughexperience.;3wh-类连接词引导主语从句

wh-类连接词不但起连接作用，还在主语从句中作成分。连接代词在主语从句中作主语,宾语,表语,定语等，连接副词在主语从句中作时间,地点,原因,方式等状语。

WhicheverteamwinsonSundaywillthroughtothenationalchampionships.

Whoeverbreaksthelawwillbepunished.

Whyhesuddenlydisappearedstillremainsamystery.

Howhebecamerichovernightisstillapuzzle.

Beforeaproblemcanbesolved,itmustbeobviouswhattheproblemitselfis.

;4“it”做形式主语时,“that”不能省略。

Itiscommonknowledgethatthewhaleisnotafish.

ItseemsarealpitythatthousandsofpeoplewhocouldhavebenefitedfromtraditonalChineseMedicinemissedoutbecauseofignorance.

Ithappensthathecanunderstandalittleaboutthelanguage.

Itisunfairthatinsomecountrieswomenarestilltreatedunequally.;;2介词宾语从句（whether不能换成if）

Successdependsonwhetherwemakeenougheffort.

MyfellowstudentshavebeguntoacceptforwhoIam.

除在except,in,but,besides后,that引导的从句一般不直接作介词的宾语。

Iknownothingaboutmynewneighbourexceptthatheisadoctor.;3系表结构的宾语从句

sure,certain,glad,pleased,happy,afraid,surprised,satisfied,sorry等表示情感的形容词与be一起构成系表结构时，其后的从句也被视为宾语从句。

Weareallgladthatwehaveonceagainovercomethedifficulty.

IamsorrythatIhavetroubledyousolong.

;4if和whether引导宾语从句的区别

※作“是否”讲常可通用。

1)介词后用whether.

Iamthinkingofwhetherweshouldgofishing.

2)与ornot连用时用whether

Ican`tsaywhetherornothewillcomeontime.

3)与不定时连用时用whether.

Ireallydon`tknowwhethertoacceptorrefuse.

4)宾语从句前置时只用whether

Whethertheycanfinishtheworkontime,wedon`tknow.;5宾语从句的时态

1）当主句的谓语动词是现在时或将来时时，其宾语从句的时