It 构成的句型小结 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 Just a minute, it won't take me long to change. 等一下,我很快就可以换好衣服。 It takes five minutes to walk there. 走到那里需要 5 分钟。 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。 It takes time for them to prepare for the great changes that take place in space. 他们需要很多时间准备应付太空中所发生的巨大变化。 3. It is + 形容词 + (for / of sb.) to do sth. 某人做某事是… …的 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。 It was kind of you to help us. 谢谢你对我们的帮助。 What time would it be most convenient for me to call again? 什么时候我再给你打电话最合适？ It’s very good of you to have listened to me. 感谢你能 听 我讲 。 4. It is + 名词 + to do sth. 做某事是… …的 常用于该 句型的名词有：manners, duty, fun, good, a great honour 等。 As a student, it is bad manners to come late to class. 作为学 生，上 课 迟 到是没 有礼 貌 的。 It is our duty to pay...
