(1)为平衡句子,通常把不定式作主语改为it 作形式主语,即:
①It's +adj./n. for sb. to do sth.
常见形容词:easy, difficult, convenient, possible 等。
It is possible for me to make a tour around the world. 【考点2】 it 作形式主语
②It's +adj. +of sb. to do sth.
常见形容词:kind, good, nice, wrong, careless, honest,wise, foolish, polite, clever, right, unwise, stupid, thoughtful, rude, silly, impolite等表示某人的品行的词语。 It is honest of the boy to tell the truth.
(2)It is no use / no good /useless / senseless + doing sth. 【考点2】 it 作形式主语
2. it 代替整个句子,放在句首充当形式主语:
(1)It is + adj./n. + that从句
(2)It is + v.ed + that从句
常见过去分词:said, reported, known, expected, thought, believed, considered, suggested等。
当表示命令、建议、坚持、忠告等意义时,从句要用虚拟语气(should)+do。 【考点2】 it 作形式主语
(3)It doesn't matter/ makes no difference+特殊疑问词/whether引导的从句
(4)It seems/ appears+that从句:似乎/好像……
(5)It happens+that从句:碰巧,恰巧…… 【考点2】 it 作形式主语
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