人教課標(biāo)版高一必修3unit4-文庫吧
2025-07-29 13:08 本頁面
【正文】 a mystery. ： 主語從句可以前置，也可以后置。用 it做形式主語，而把主語從句，在句末，常用下面幾種句型。 1） It + be + 表語 +主語從句 表語：（名詞， 形容詞，過去分詞） 2） It+不及物動詞 +主語從句 It seemed (happened, doesn’ t matter, has turned out) that… It is still uncertain whether he is ing or not. It happens that they were absent. It is a fact (a shame, a pity, good news…) that… 3) It +及物動詞（被動語態(tài)） +主語從句 It has been decided that the exhibition will not open on Sundays. 注意 : 1）主語從句在句首時，必須由連接詞引導(dǎo)，不能省略這些連接詞；但是如果用 it做形式主語，而把主語從句放在句末時，從屬連詞 that可以省略。 誤： They should like each other is natural. 正： That they should like each other is natural. 正： It is natural that they should like each other. 2)如果主語從句放在句首，不能用 if引導(dǎo)，但是如果用 it 做形式主語，而把主語從句放在句末時，也可以用 if引導(dǎo) . 誤： If Mary really heard him is really doubtful. 正： It was doubtful if Mary really heard him. 主語從句三要素 he became a great scientist is known to us all. Is what you told me really true? 謂語動詞用單數(shù) 從
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