名词性从句;一、概念;思考：如果把名词所充当的成分换成句子我们称之为什么？;;(1)Whathesaidisnottrue.
(2)Whetherhewillgothereisnotknown.
(3)Whoevercomesiswelcome.
(4)It’scertainthathewillsucceed.
(5)Whentheywillstarttheprojecthasnotbeendecidedyet.;位于动词（谓语动词/系动词）之前；;（3）It+be+过去分词(said/reported/thought/believed/decided等)+that从句eg：Itissaidthatwewillhavealongholiday.
（4）It+不及物动词（seems/appears/happens等）+that从句eg:Itappearsthatwewon’tbelaidoff.看起来我们不会被解雇。
;(1)Theyallthinkthatthegirlisverybeautiful.
(2)HeaskedhowmuchIpaidforthebook.
(3)Shemadeitclearthatshetriedherbesttodothejob.
(4)Ifinditnecessarythatweshouldfinishthehomeworktogether.
(5)Italldependsonwhetherhewillsupportme.;1、位置：;(1)Theproblemisthatwedon’thaveenoughmoney.
(2)Theissueiswhetherwecanfinishtheprojectbythedealine.
(3)Theimportantthingishowwerespondtounexpectedchallenges.
(4)Ilovethissong.That’sbecauseitremindmeofmychildhood.
(5)Itseemsasifheknowstheansweralready.;1、位置：位于系动词之后;2、asif/asthough（似乎，好像）引导的表语从句，常放在be,seem,look,taste,sound等之后；eg:Itsoundsasifyouhaveagoodtime.
3、because和why引导的表语从句
This/Thatis/wasbecause···这是/那是因为···
This/Thatis/waswhy···这是/那是···的原因
eg:Hehaslungcancer.Thatisbecausehehasbeensmokingtoomuch.;(1)Thenewsthathecouldn’tcomemadeusupset.
(2)Ihavenoideawhethershewillattendthemeeting.
(3)Ihavenoideawhattheyaretalkingabout.
(4)Thereisnodoubtthatsheisthebeststudentinourschool.
(5)Hisbeliefthathardworkleadstosuccessisadmirable.;利润60%;3、that引导定语从句和同位语从句的区别:
在定语从句中，that指人或物，作主语或宾语，作宾语时可以省略；在同位语从句中，that不作成分，没有实意，不能省略；
eg:ThenewsthathetoldmewasTomwasill.(定语从句)（对news进行限定修饰）ThenewsthatTomwasillwastoldbyhim.(同位语从句)（对news消息的内容进行解释）
;220万;Whether和if引导名词性从句的区别：（只用whether的情况）
（1）引导主语/表语/同位语从句；
???2）作介词宾语：
（3）后接动词不定式；
（4）后有ornot时；
（5）作discuss/decide/advise/choose/consider的宾语;;what和which在名词