e.g. What the lecturer said is very valuable.
We wonder what he will do next. 2. that引导名词性从句不充当任何句子成分,只起连接作用,无任何意义。引导主语从句时,常用it作形式主语,谓语动词用单数,引导宾语从句时,常被省略。
e.g. That she will refuse the offer seems
unlikely.
I have found (that) all the tickets have
been sold out.
It is a pity that you missed such a fine
talk. (三)主语从句 1. 主语从句的基本用法 1) that引导的主语从句既可放在句首,也可放在句尾,that起连接作用,无词义,在从句中不作成分,一般不能省略。
e.g. That we are invited to a concert this
evening is good news to us.
=It is good news to us that we are
invited to a concert this evening. 2) whether引导的主语从句可放在句首,也可放在句尾;if引导的主语从句只能放在句尾,前面需要it作形式主语。whether/ if 起连接作用,“是否”,在从句中不作成分。
e.g. Whether he will go there or not is not
clear.
It is doubtful whether/ if the work
can be completed. 3) wh类连接词引导的主语从句:
wh类连接词包括wh类的连接代词(who, whom, whose, which, what, whoever, whomever, whichever, whatever等)和连接副词(when, where, how, why, whenever, wherever, however等)。what, when和wh-ever类的词有时可不表疑问。wh类连接代词在句中既起连接作用,又可充当主语、宾语、表语、定语等成分。wh类连接副词在句中起连接作用,在从句中可充当时间、地点、原因、方式状语。 2. 主语从句的单复数问题 1) 从句作主语时,谓语动词一般用单数。
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