4.用whether或if引导的宾语从句,其主语和谓语的顺序也不能颠倒,仍保持陈述句语序。此外,whether与if 在作“是否”的意思讲时一般只能用whether,不用if。 ①引导主语从句并在句首时;②引导表语从句时;③引导从句作介词宾语时;④从句后有“or not”时;⑤后接动词不定式时。 Everything depends on whether we have enough money. 一切要看我们是否有足够的钱。 I wonder whether he will come or not. 我想知道他来还是不来。
5.注意宾语从句中的时态呼应。当主句动词是现在时,从句根据自身的句子情况而使用。当主句动词是过去时态(could, would除外),从句则要用相应的过去时态,如一般过去时,过去进行时,过去将来时等;当从句表示的是客观真理,科学原理,自然现象,则从句仍用现在时态。 The teacher told us that Tom had left us for America.(主句是一般过去时,从句为过去完成时) 四、表语从句 引导表语从句的关联词与引导主语从句的关联词大致一样,表语从句位于连系动词后,有时用as if引导。其基本结构为:主语 + 系动词 + that从句。 This is where our problem lies. 这就是我们的问题所在。 It looks as if it is going to rain. 看上去天要下雨了。 1.需要注意的,当主语是reason时,表语从句要用that引导而不是because。 The reason why he was late was that he missed the train by one minute this morning. 他迟到的原因是他今天早晨差一分钟没赶上火车。 2.whether 可引导表语从句,但与之同义的if却通常不用于引导表语从句。 五、同位语从句 同位语从句说明其前面的名词的具体内容。同位语从句通常由that引导,可用于同位语从句的名词有advice, demand, doubt, fact, hope, idea, information, message, news, order, problem, promise, question, request, suggestion, truth, wish, word等。 I have no idea when he will come back home. 我不知道他什么时候回家。 The thought came to him that Mary had probably fallen ill. 他想到可能玛丽生病了。 同位语从句和定语从句的区别:that作为关系代词,可以引导定语从句,充当句子成分,在从句中作宾语时可以省略; that引导同位语从句时,起连词的作用,没有实际意义,不充当句子成分,一般不能省略。 I had no idea that you were here. 我不知道你在这儿。(that引导同位语从句,不能省略) Have you got the idea(that)this book gives you of life in ancient Greece?(that引导定语从句,作宾语,可以省略) 你知道吗?这本书向你描述了古希腊的生活。 六、常考的名词性that从句 用it作形式主语的that从句有以下4种不同的搭配关系: 1.It + be +形容词+ that从句 It is necessary that… 有必要…… It is important that… 重要的是…… It is obvious that… 很明显…… 2.It + be + ed 分词+ that从句 It is believed that… 人们相信…… It is known to all that… 众所周知…… It has been decided that… 已决定…… 3.It + be +名词+ that从句 It is common knowledge that… ……是常识 It is a surprise that… 令人惊奇的是…… It is a fact that… 事实是…… 4.It +不及物动词+ that分句 It appears that… 似乎…… It happens that… 碰巧…… It occurred to me that… 我突然想起…… 七、否定转移 ①将think, believe, suppose, expect, fancy, imagine等动词后面宾语从句的否定词转移到主句中,即主句的谓语动词用否定式,而从句的谓语动词用肯定式。 注意:若谓语动词为hope,宾语从句中的否定词不能转移。 I hope you weren't ill. 我想你没有生病吧。 ②将seem, appear 等后的从句的否定转移到前面。 It doesn't seem that they know where to go. 看来他们不知道往哪去。 It doesn't appear that we'll have a sunny day tomorrow. 看来我们明天不会碰上好天气。 ③有时将动名词、介词短语或整个从句的否定转变为对谓语动词的否定。 I don't remember having ever seen such a man. 我记得从未见过这样一个人。 (not否定动名词短语 having…) It's not a place where anyone would expect to see strange characters on the street. 在这里,人们不会想到在街上会碰上陌生的人。 (anyone 作主语,从句中的谓语动词不能用否定形式。) ④有时状语或状语从句中否定可以转移到谓语动词前。 The ant is not gathering this for itself alone.(否定状语) 蚂蚁不只是为自己采食。 He was not ready to believe something just because Aristotle said so. (否定because状语)
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