it用法总结(高三总复习)

(3) 动词 + prep + it + that-从句。如： • See to it that you’re not late again. 注意千万 不要再迟到。 • Look to it that this doesn’t happen again. 注意 不要再发生这种事。 • You may rely on it that he’ll come to meet you. 你放心，他会来接你的。 • I can’t answer for it that he will come. 我不能 保证他会来。 【说明】能用于此结构的动词不多，常见的有see to, look to, insist on, stick to, depend on, answer for 等。
• (4) It takes sb. + 时间段 + to do sth. 某人 做某事花了……时间 • It takes years to master a new language. 要 花多年的时间才能掌握一门新的语言。
【Tip】此句型可以有以下多变种变体： It took me an hour to write the letter. =The letter took me an hour (to write). =I took an hour to write the letter.
• 3. 代替某些代词 • 代词 it 还可用于代替指示代词this, that 以及复合不定代词 something, anything, nothing等。如： • “What’s this?” “It’s a new machine. ” “这是什么?”“是一种新机器”。 • Nothing is wrong, is it? 没出什么问题， 是吗?
It is hard for him to make up his mind. 他很难下
2) It is V-ed + that ① It is said (reported, learned) + that… It is said that he has come to Beijing.
② It is suggested ( ordered, demanded, insisted, commanded) + that … 从句中的过去分词是表示请求，建议，命令等词 时， that后的从句要用虚拟语气(should + V原 形). Should可以省略。译为“据建议；有命令…” It is suggested that the meeting (should) be put off.
二、it 作非人称代词的用法
1. 基本用法 it 作非人称代词的用法，主要用于指时间、距离、 价值、天气、气候及温度等自然现象。 1. It is Friday today. date 2. It was very cold last Monday. weather 3. It is about 8:30 now. time distance 4. It is about 25km from Linquan to Fuyang. 5. It lies in the south of Anhui. place 6. It is 40°C ! You got a high fever!
2. 用作形式宾语的几个特殊结构 (1) 动词+ it + that-从句。如： • I like it that you came. 你来了，我很高兴。 • I take it (that) he will come on time. 我认为他 会准时来的。 • You can put it that it was arranged before. 你 可以说这是以前安排的。 • Rumor has it that the defence minister will soon resign. 据传闻，国防部长不久就要辞职。 【说明】能用于此结构的动词不多，常见的有 have, take, put, like 等。
• (4) 动词 + it + 介词短语+ that-从句。如：
• I owe it to you that I am still alive. 多亏 有你我才仍然活着。 • I took it for granted that he would help us. 我认为他会帮助我们的。 【说明】能用于此结构的动词不多，常见的 有take it for granted, bring it to sb’s attention, owe it to sb 等。
It is two weeks since I saw him
• • • •
It’s + 时间段 + 自从 …… 有一段时间了。 It'ssince. ten years before I graduated. It’s + 时间段It's + ten before. 过多长的时间才 … it’s=it was years that I've lived here for It‘s + 时间段 + that. … 多久了 It was ten years ago when I graduated It's + 时间段 + when ...是在某个时刻
2. 用作形式主语的的重要句型 (1) it 作形式主语替代不定式 构成”It + be + adj. for (of) sb to do sth“ 某人做某
事……
定决心。 It was foolish of her to say such a thing. 她说那 样的话，真是太蠢了。 【Tip】介词 of 与 for 的区别是： of 用于指某人的性格、属性、特征等，介词 for表示对象，意为“对……来说”
(5) It is up to sb to do sth. 该由某人做某事 • It’s up to you to to make the choice. 得由你来 作选择。 (6) it look (seem, appear, happen, occur) that [as if]… 似乎…… • It seemed as though he didn’t recognize me. 他似乎没认出我来。 • It happened that I was out when he called. 他 打电话时我碰巧不在家。 (7) If it were not for… / If it hadn’t been for… 若不是因为…… • If it were not for their help, we couldn’t have got over the difficulties. 要不是他们帮助，这 些困难我们不克服不了的。
temperature
2. 用于某些句型 is time for breakfast. • It’s time for sth. It该做某事了。 is time to have breakfast. • It’s time to do It sth. 该做某事的时候了。 is time for us to have breakfast. • It’s time for It sb to do sth. 某人该干某事了。 • It’s (about / high) time + that-从句. 某人该做某事了。 (从句谓语用过去式，有时也用“should+动词原 形”) It is the first time I’ve been here. • It’s first (second) time + that-从句. 某人第几次干某 事。(从句谓语用现在完成时)
• 2. 指人 • it 指人主要用于指不性别不明的婴儿或用 于确认某人的身份。如： • Is it a boy or a girl? 是男孩还是女孩? • There is a knock on the door. It must be the postman. 有人在敲门，一定是邮递员。
• 【说明】在答语中，常用来指本人，如 说 It’s me。
五、用于强调句型中
1) It + be+被强调部分 + that/who (a person) 从句 I met Tom in the park yesterday. 1) It was I who met Tom in the park yesterday. 2) It was Tom who I met in the park yesterday. 3) It was in the park that I met Tom yesterday. 4) It was yesterday that I met Tom in the park.
四、it用作形式宾语
1. 基本用法 • 当不定式、动名词、从句等复杂成分用作宾语且 其后跟有宾语补足语时，通常会在宾语补足语前 使用形式宾语，而将真正的宾语移至句末。 • 其基本结构为“动词+it+宾语补足语+不定式(动 名词或从句)”。如： • I find it difficult to do the job well. 我发现做 好这件事不容易。 • I think it best that you should stay here. 我认 为你最好住这儿。 • We think it no use complaining. 我们认为抱怨 是没有用的。
2) It is not until + 被强调的部分+ that…
该句型也是强调句型，主要用于强调时间状语， 译成“直到…才…”，可以说是not… until… 的强 调形式。 It was not until she took off her dark glasses that I realized she was a famous film star. = Not until she took off her dark classes did I realize she was a famous film star. = I didn’t realize she was a famous film star until she took off her dark glasses.
3) It is a pity (a shame) that… That 后的从句一般用虚拟语气 (should+V原形), should 可以省略. 表示出乎意料，译为 ”竟然“。 没有这种意义时，则不用虚拟语气。 It is a pity that such a thing (should) happen in your class.
一、it 作人称代词的用法
• 1. 指事物 • 作为人称代词，it 可以除人以外的一切事 物或动物。如： • I dropped my watch and it broke. 我 把手表掉在地上摔坏了。 • It’s hard work, but I enjoy it. 工作很 辛苦，可是我乐意干。 • “Where is the dog?” “It’s in the bedroom. ” “狗在哪?”“在卧室里”。
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• (2) 动词 + it + when (if)-从句。如：
• I dislike it when you whistle. 我不爱听你吹口哨 。 • We really appreciate it when she offered to help. 她来帮忙了，我们十分感激。 • I’d prefer it if I didn’t have to do so much work. 要是我不必做那么多工作，好就太好了。 【说明】能用于此结构的动词不多，常见的有 enjoy, hate, love, like, dislike, appreciate, prefer 等。
三、it用作形式主语
1. 基本用法 • 当不定式、动名词、从句等复杂成分用作句子主 语时，为保持句子平衡，通常把真正的主语放在 句末，而在句首使用形式主语it。如： • It’s very important to remember this. 记住这 一点很重要。 • It’s hard work climbing mountains. 爬山是费劲 的事。 • It’s unknown when he will come. 他什么时候来 还不知道。