PRON-SING 它(指物体、植物或上文已提及的其余事物) You use it to refer to an object, animal, or other thing that has already been mentioned.
He saw the grey Land-Rover down the bypass. It was more than a hundred yards from him...
It's a wonderful city, really. I'll show it to you if you want...
PRON-SING (指小孩或婴儿)它 You use it to refer to a child or baby whose sex you do not know or whose sex is not relevant to what you are saying.
She could, if she wanted, compel him, through a court of law, to support the child after it was born...
He threw the baby high in the air and it stopped crying.
PRON-SING (抽象指代刚描画过的情形) You use it to refer in a general way to a situation that you have just described.
He was through with sports, not because he had to be but because he wanted it that way...
Antonia will not be jealous, or if she is, she will not show it.
PRON-SING (用于某些名词、描述词、动词前说明对某情况的感触、观念) You use it before certain nouns, adjectives, and verbs to introduce your feelings or point of view about a situation.
It was nice to see Steve again...
It's a pity you never got married, Sarah...
PRON-SING (用于自动句中引出一个情况或事情) You use it in passive clauses which report a situation or event.
It has been said that stress causes cancer...
Yesterday it was reported that a number of people had been arrested in the capital...
PRON-SING (与动词连用,作模式主语或宾语) You use it with some verbs that need a subject or object, although there is no noun that it refers to.
Of course, as it turned out, three-fourths of the people in the group were psychiatrists...
当然,结果是那群人中 3/4 是肉体病学家。
I like it here...
PRON-SING (用作 be动词的主语,指钟点、星期、日期) You use it as the subject of 'be', to say what the time, day, or date is.
It's three o'clock in the morning...
当初是清晨 3 点整。
It was a Monday, so she was at home...
PRON-SING (用作系动词的主语，www.11rfd.com，描画天气、光线或温度) You use it as the subject of a link verb to describe the weather, the light, or the temperature.
It was very wet and windy the day I drove over the hill to Milland...
It's getting dark. Let's go inside...
PRON-SING (尤用于刚接通电话时讯问、告知身份) You use it when you are telling someone who you are, or asking them who they are, especially at the beginning of a phone call. You also use it in statements and questions about the identity of other people.
'Who is it?' he called. — 'It's your neighbor.'...
Hello Freddy, it's only me, Maxine.
PRON (与动词 be 连用，www.11sunt.com，www.22rfd.com，强调突出某物) When you are emphasizing or drawing attention to something, you can put that thing immediately after it and a form of the verb 'be'.
It's really the poor countries that don't have an economic base that have the worst environmental records...
It was the country's rulers who devised this system...
PHRASE 并不是由于/不只仅由于 You use it in expressions such as it's not that or it's not simply that when you are giving a reason for something and are suggesting that there are several other reasons.
It's not that I didn't want to be with my family...
It's not just that a gulf exists in living standards — there's a psychological ravine.
PHRASE 自认为很了不起 If you say that someone thinks they're it, you mean that they think they are better or more important than they really are.