引导名词性从句时,that没有词义,在从句中不作任何成分。当从句意义完整,不缺任何成分时,往往选用that;而what引导名词性从句时,意为“什么”或“……的”,在从句中用来作主语、表语或宾语。 What was most important to her,she told me,was her family.(主语从句;what作主语) Before the sales start,I make a list of what my kids will need for the coming season.(宾语从句;what作宾语) As a new graduate,he doesn’t know what it takes to start a business here.(宾语从句;what作宾语) China is no longer what she used to be.(表语从句;what 作表语) It never occurred to me that you could succeed in persuading him to change his mind.(主语从句) One reason for her preference for city life is that she can have easy access to places like shops and restaurants.(表语从句) 【悟一悟→参透误区】 (1)that引导主语从句时,常用it作形式主语,常见句型有: ①it+be+形容词(如: obvious,true,natural,surprising,good,wonderful,funny,possible,likely,certain,probable,evident,clear,apparent等)+that从句。 People are social creatures by nature,and so it is hardly surprising that part of their selfrespect comes from the approval of others.(2017·江苏高考) ②it+be+名词(如: no wonder,an honour,a good thing,a pity,no surprise等)+that从句。 It’s a great pity that it’s probably the last time this will happen. ③it+be+过去分词(如: said,reported,thought,estimated,expected,decided,announced,arranged,recognized等)+that从句。 It is known to all that physical exercises can improve our physical and mental health. 类似句型还有:It cannot be denied that... /It must be admitted that... ④it+动词(如:seem,appear,happen,occur to sb.,doesn’t matter,make no difference等)+that从句。 It doesn’t matter whether you turn right or left at the crossing—both roads lead to the park.(2017·天津高考) It suddenly occurred to him that he had left his keys in the office.(2017·江西高考) (2)that引导主语从句,置于句首时,that不能省略。 That we are invited to a concert this evening is good news to us. (3)that引导宾语从句,常可省略。可接that从句作宾语的动词有:see,say,know,imagine,discover,believe,tell,show,think,consider,be sure,be afraid等。可以接复合宾语的动词有: think,make,consider,find,feel,suppose等,在他们之后,可以用it作形式宾语,而把真正的宾语that从句后置。此时that不可省略。 Do you know (that) he has joined the army? We consider it necessary that he should improve his pronunciation. (4)当一个句子有两个或多个并列的宾语从句时,除第一个从句的that外,都不可省略。 He told me (that) the power would be cut off and that I should get ready. (5)引导表语从句:that引导表语从句,不可省略。 My decision is that all of us are to start at 6 o’clock tomorrow. 四、连接词whether/if(是否)的用法 两者都可引导宾语从句,常可互换使用。但以下情况不能互换: 1.宾语从句是否定句时,只用if,不用whether。 I wonder if it doesn’t rain. 2.用if会引起误解,就要用whether。 Please let me know whether you want to go.(此句如果把whether改成if,可作条件状语从句,因而产生歧义。) 3.宾语从句中的whether与or not直接连用,就不能换成if。 I don’t know whether or not the report is true. 4.介词后的宾语从句要用whether引导。whether可与不定式连用,也可引导主语从句、表语从句、同位语从句,还可引导让步状语从句。 Whether you can make progress in your study depends on whether you try your best. I don’t know whether to laugh or to cry. Whether you like that gift he gave you,you should express your gratitude. 5.在句首引导主语从句时只能用whether。doubt用于肯定句时,其后的宾语从句用whether或if引导;doubt用于否定句时,其后的从句用that引导。 Whether they will agree with the plan is not clear. I doubt whether/if you have told me the truth. I don’t doubt that you are the right person for the job. 五、whoever,whatever,whichever,wherever,whenever,however的用法 它们的作用等同于who,what,which,where,when,how,但语气加强了。这类词引导名词性从句时,不能用no matter+who/what...代替。 1.引导主语从句。 Whoever did this job must be rewarded. 2.引导宾语从句,充当直接宾语。 I’ll give you however much money you need. 3.引导宾语从句,充当间接宾语。 She will give whoever needs help a hand. 4.引导介词的宾语从句。 You can write about whatever topic you prefer. 5.引导宾语从句,充当宾语补足语。 We’ll make him whatever he is fit for. [学以致用] Ⅰ.用适当的连接词填空 1.(2017·陕西高考)________the delayed flight will take off depends much on the weather. 2.(2017·天津高考)I think ________ impresses me about his painting is the colours he uses. 3.(2017·大纲全国)Exactly________the potato was introduced into Europe is uncertain,but it was probably around 1565. 4.(2017·北京高考)Some people believe ________ has happened before or is happening now will repeat itself in the future. 5.(2017·福建高考)Pick yourself up. Courage is doing________you're afraid to do. 6.(2017·山东高考)It is difficult for us to imagine ________ life was like for slaves in the ancient world. 7.(2017·北京高考)The best moment for the football star was ________ he scored the winning goal. 8.(2017·四川高考)Grandma pointed to the hospital and said,“That's________I was born.” 9.(2017·湖南高考)As John Lennon once said,life is ________ happens to you while you are busy making other plans. 10.(2017·浙江高考)“Every time you eat a sweet,drink green tea.”This is________ my mother used to tell me. 11.(2017·陕西高考)I think________it’s our duty to help parents do some housework. 12.(2017·北京高考)I took pride in________I had done in the absence of my father. 13.(2017·新课标全国卷Ⅰ)I am wondering________you can pick him up at the airport.
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