In English, it is written as it.
As a personal pronoun, It can refer to things or animals whose gender is unclear. It can also refer to babies, unknown people, and undetermined people’s identities and conditions. Or it can express weather, time, distance, natural phenomena, or environment.
It has been three years since my brother got married.
My brother has been married for three years.
It gets hot and humid in summer.,
It gets hot and humid in summer.
It’s about two miles from here to the town.
It’s about two miles from here to the town.
How is it going at school?
How is it going at school?
How do you like it here?
How do you like it here?
The quotation itself has no real meaning and only serves as a guide. Quotes are not stressed.
The quotation it can be used as a formal subject or a formal object, and the real subject can be a verb infinitive, a gerund and a sentence. In some sentences, it is a fictitious subject, not a formal subject, and the that clause is an external subject clause, but there is no non-external form.
It’s important to keep a promise.
It’s important to keep a promise.
It isn’t easy to get out of a bad habit.
It isn’t easy to get out of a bad habit.
It’s no use crying over spilled milk.
It’s difficult to collect water.
It’s important that you should obey the rules.
It’s important to obey the rules.
It makes no difference how you do it.
It makes no difference how you do it.
It happened that the weather was exceptionally hot.
The weather happened to be extremely hot at the time.
Air tanks make it possible for divers to breathe under water.
Scuba makes it possible for divers to breathe under water.
I found it surprising that she didn’t know who Michael Jordan was.
I found it surprising that she didn’t know who Michael Jordan was.
I found it surprising that she didn’t know who Michael Jordan was.
It cost me thirty dollars to fix the computer.
It cost me thirty dollars to fix the computer.
It takes me two hours to get to the airport.
It takes me two hours to get to the airport.
I take it for granted that they got divorced.
I take it for granted that they got divorced.
I take it that he isn’t interested in this book.
I take it that he isn’t interested in this book.
Legend has it that there is a dragon in the lake.
Legend has it that there is a dragon in the lake.
It can also be used in emphatic sentences, with no reference relationship and no real meaning. Remove the three words "it is...that/who" and the remaining words can form a complete sentence alone.
It was I who met Marilyn in the park yesterday.
It was I who met Marilyn in the park yesterday.
It was Marilyn that I met in the park yesterday.
It was Marilyn that I met in the park yesterday.
It was in the park that I met Marilyn yesterday.
I met Marilyn in the park yesterday.
It was yesterday that I met Marilyn in the park.
I met Marilyn in the park yesterday.
It was Robbie whose mother I met.
I met Robbie’s mother.