it

音標(biāo)發(fā)音

用it作人稱代詞,可替代無生命的東西或事情,在性別不詳或無所謂時(shí),也可指代人,尤其是指嬰兒。
it作主語(yǔ)時(shí),可指自然現(xiàn)象、季節(jié)、時(shí)間、距離、環(huán)境等。
it可以作先行詞，用於強(qiáng)調(diào)句型中,強(qiáng)調(diào)主語(yǔ)、賓語(yǔ)、時(shí)間狀語(yǔ)、地點(diǎn)狀語(yǔ)、介詞賓語(yǔ)或從句等,強(qiáng)調(diào)句型中的it一般指已發(fā)生過的事,而不指尚未發(fā)生或提及的事。
it還常用作形式主語(yǔ)或形式賓語(yǔ),代替較長(zhǎng)的真實(shí)主語(yǔ)或真實(shí)賓語(yǔ)(其形式多爲(wèi)動(dòng)詞不定式短語(yǔ)或that從句等)。
it可以代替前麪提到的某個(gè)名詞、代詞或句子,但在believe, expect, forget, imagine , remember, think等詞後常常省略。

This suitcase looks heavy but actually it is very light.
這個(gè)皮箱看上去很重,實(shí)際上很輕。

(THING) used as the subject of a verb, or the object of a verb or preposition, to refer to a thing, animal, situation, or idea that has already been mentioned
(SUBJECT/OBJECT) used as the subject or object of a verb to represent a phrase at the end of the sentence
(TIME/WEATHER) used to talk about the time, date, weather, or distances

You use it to refer to an object, animal, or other thing that has already been mentioned.
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.
You use it to refer in a general way to a situation that you have just described.
You use it before certain nouns, adjectives, and verbs to introduce your feelings or point of view about a situation.
You use it in passive clauses that report a situation or event.
You use it with some verbs that need a subject or object, although there is no noun that "it" refers to.
You use it as the subject of "be" to say what the time, day, or date is. (be)
You use it as the subject of a linking verb to describe the weather, the light, or the temperature.
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.
When you are emphasizing or drawing attention to something, you can put that thing immediately after it and a form of the verb "be." (be)
You use it in expressions such as it's not that or it's not just that when you are giving a reason for something and are suggesting that there are several other reasons. (it's not that)(it's not just that)
if it wasn't for&rarrsee be
Italy