表语从句

PredicativeClauses表语从句Thequestioniswhetherwecanrelyonhim.That’sbecausewewereinneedofmoneyatthattime.Helookedasifhewasgoingtocry.That’swhyIwaslate.表语从句:在句中充当表语成分，一般放在连系动词之后.作用：对主语进行解释说明。表语从句是在复合句中作表语的名词性从句,放在系动词之后,一般结构是“主语+系动词+表语从句”。可以接表语从句的系动词有be,look,remain,seem等。另外,常用的还有thereasonwhy…isthat…和Itisbecause…等结构。例如：一、表语从句三要素引导词（连接词）语序时态when/where/why/how/becausethat/whether/asif/asthough（if不引导表语从句)who/whom/whose/which/what由从属连词that引导的表语从句由连接代词Who,whom,whose,which,what和连接副词where,how,why,when引导的表语从句由从属连词whether，asif\though引导的表语从句（一）引导词123e.g.1.WhatIwanttosayisthatI’msorry.•IthinkitnecessarythatyoushouldreadEnglishaloud.由从属连词that引导的表语从句注：that在从句中不能省略由从属连词whether,asif引导的表语从句1.Thequestionis_______________________2.Iwonder_________________________.whetheritisworthdoing.whetheritisrightorwrongitwasgoingtorainwhether“是否”，说明对陈述的事物不明确或不清楚。asif表似乎，猜测Itlookedasif____________________1.Thatis_________________________.2.Thatwas____________________.3.Theproblemis_____________________.4.Histroubleis______________________.whatheisworriedaboutwhytheymadeabethowtheycangetfoodwherehecanfindhisbook由连接代词Who,whom,whose,which,what和连接副词where,how,why,when引导的宾从代词或副词连接主句和从句，并在从句中担任句子成分，具有一定的意义（保留疑问含义），不可省略。注意：1.一般情况下，“that”不能省。2.Itis/wasbecause….Itis/waswhy….1.在表语从句中，表“是否”时，只能用“whether”不能用“If”。3.Thereason(why…/for…)is/wasthat….4Thereasonisbecause/why…that….注意表语从句的引导词与宾语从句相同.但:1.that引导表语从句时不能省.2.if不能引导表语从句.二、语序表语从句的语序用陈述语序：连接词+主语+谓语+其他成分1.Whenwillhegotothelibrary?Thequestioniswhenhewillgotothelibrary.Thequestioniswhenwillhegotothelibrary.2.Thatiswhatheisworriedabout.Thatiswhatisheworriedabout.主句+连接词+从句（主+谓+其他成分）Itiswherehelivesin.Itiswherehelivedin10yearsago.三、时态1.主句用现在时或将来时，从句可用任何时态，根据实际情况而定。2.如果主句是过去的时态（一般过去时，过去进行时），从句的时态一定要用相对应的过去的某种时态（一般过去时，过去进行时，过去将来时，过去完成时）Herwishwasthatshecouldloseweightsoon.Itlookedasifitwasgoingtorain.Thequestionwaswhetherhisfatherwouldcomebacktomorrow.Thereasonwhyhewaslatewasthatthetrainhadalreadyleft.