用代词 it作形式主语。 3) 由连接代词或连接副词以及 whether 引起的主语从句。 Whether they will sell the house is not yet decided. 他们是否卖掉这所房子还没有决定。 4) whatever, whoever 也可引导主语从句。 Whatever was said here must be kept secret. 这里说的话都应当保密。 Whoever makes mistakes must correct them. 凡犯了错误的人都必须改正。注意:有时为了使句子结构平衡, 避免“头重脚轻”, 常用 it 作形式主语, 而把从句放在后面。例如: It is a pity that she has made such a mistake. 她犯了这样一个错误, 真是遗憾。这样就构成了下面一些常用句型: 1) It is + adj. / n. + 从句 It is a pity/shame that... 遗憾的是…… It is possible that... 很可能…… It is unlikely that... 不可能…… 2) It + 不及物动词+ 从句 It seems/appears that... 似乎…… It happened that... 碰巧…… 3) It + be + 过去分词+ 从句 It is said that... 据说…… It is known to all that... 众所周知…… It is reported that... 据报道…… It is believed that... 据信……;人们相信…… It is suggested that... 有人建议……
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