it

音标发音

用it作人称代词,可替代无生命的东西或事情,在性别不详或无所谓时,也可指代人,尤其是指婴儿。
it作主语时,可指自然现象、季节、时间、距离、环境等。
it可以作先行词，用于强调句型中,强调主语、宾语、时间状语、地点状语、介词宾语或从句等,强调句型中的it一般指已发生过的事,而不指尚未发生或提及的事。
it还常用作形式主语或形式宾语,代替较长的真实主语或真实宾语(其形式多为动词不定式短语或that从句等)。
it可以代替前面提到的某个名词、代词或句子,但在believe, expect, forget, imagine , remember, think等词后常常省略。

(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