一、 It作形式主语的句型
为使句子平衡,往往把it置于句首作形式主语,而把真正的主语(通常是不定式短语、动名词短语或主语从句)移至句末。It 作形式主语的句型有:
㈠ it 代指不定式短语的句型
1. It takes + (sb.) + sometime / some money + to do sth.
做某事花去某人多长时间
It took me three days to prepare for the examination. 我花了三天准备那次考试。
It takes a lot of money to buy a house like that. 买那样一幢房子需要很多钱。
2. It takes + 名词 + (for sb.) to do sth. 某人做某事需要
It took great imagination as well as patience for Annie to teach me to speak.
对安妮来说,教我说话需要极大的信心和想象力。
3. It is + 形容词 + (for / of sb.) to do sth. 某人做某事是 的
常用于该句型的形容词比较多。for sb. 的句型 常用于表示事物的特征特点,表示客观形式的形容词,如easy, difficult, hard, important, possible, impossible, comfortable, necessary, better等。of sb的句型一般用表示人物的性格,品德,表示主观感情或态度的形容词,如kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, considerate(考虑周到的), silly, selfish(自私的) 等。
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