来源:网络资源 2022-03-10 20:12:22
由于宾语从句是由陈述句、一般疑问句或特殊疑问句等转换而来,因此,它的连接词也分三种情况:
1、从句是陈述句:用连词that引导。that没有实在意义,也不作任何成分,经常省略。
例如:I think (that) he is right.
这里需要提醒同学们注意,不能省略that的情况:
1) and连接两个或两个以上的宾语从句,第一个从句中的that可省略,后面的that不能省。
如,I know(that)he is from America and that he likes playing basketball.
2)that引导的宾语从句作except, but, besides, in等介词宾语时,that不能省。
如,I know nothing about him except that he is a doctor.
3)主句与that从句之间有插入语,that不可省。
如,I think, first of all, that we should make a plan.
4)若宾语后面有宾语补语,则宾语从句要放到补语之后,在宾补前用it作形式宾语.常常这样用的动词有find,feel,consider,make,believe等。
如,I consider it necessary that a plan should be made before doing the work.
2、从句为一般疑问句,用连词whether或if引导。
例如I wonder whether/if he will come here tomorrow.
考点:if和whether在用法上的区别:
1)if可以引导条件状语从句,whether不能。
如I will go to the park if it doesn’t rain tomorrow.
2)在下列情况时只能用whether:
用作介词的宾语时;用在不定式前面时;whether引导的从句放在句首时。
如It depends on whether he has enough money.这取决于他是否有足够的钱。
3)whether常与or not连用。
如He asked whether they would come or not.他问他们是否该来。
3、从句为特殊疑问句,用连接代词who,what,which和连接副词when,where,why,how引导。
如:(1)I don’t know when they will leave for Shanghai.我不知道他们什么时候将去上海。
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