很明显,他们急需援助。
②It is likely that a hurricane will arrive soon.
很可能飓风马上就要到达。
【注意】这类主语从句中,若形容词为necessary, important, essential, strange等,主语从句要用虚拟语气。谓语动词形式一般为“(should)+动词原形”。
③It is necessary that you_(should)_master_the_computer.
你很有必要掌握电脑。
④It is strange that he should have killed himself.
真奇怪,他竟然自杀了。
(2)It +be +名词词组+that从句
常用于这种句型的名词词组有:a fact, a good idea, a pity, an honor, a shame, no wonder, good news等。
⑤It's a pity that you_missed_the_film.
你没有看那部电影真是太遗憾了。
(3)It +be +过去分词+that从句
常用的过去分词有:said, reported, hoped, believed, expected, decided, wellknown等。
⑥It is wellknown that the earth moves around the sun.
众所周知,地球围绕太阳转。
【注意】a. it作形式主语代替主语从句时,要注意和as引导的定语从句的区别。试比较:
⑦It was reported that the US was under the terrorist attack. (主语从句,有that, 无逗号)
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