IT

It

We use it to talk about:

• times and dates:

It’s nearly one o’clock.
It’s my birthday.

• weather:

It’s raining.
It’s a lovely day.
It was getting cold.

• to give an opinion about a place:

It’s very cold in here.
It will be nice when we get home.
It’s very comfortable in my new apartment.

• to give an opinion followed by to-infinitive:

It’s nice to meet you.
It will be great to go on holiday.
It was interesting to meet your brother at last.

• to give an opinion followed by an -ing verb:

It’s great living in Spain.
It’s awful driving in this heavy traffic.
It can be hard work looking after young children.

  

Using "it" to talk about people

We use it to talk about ourselves:

• on the telephone:

Hello. It’s George.

• when people cannot see us:

[Mary knocks on door] It’s me. It’s Mary.

We use it to talk about other people:

• when we point them out for the first time:

Look. It’s Sir Paul McCartney.
Who’s that? I think it’s John’s brother.

• when we cannot see them and we ask them for their name:

[telephone rings, we pick it up] Hello. Who is it?
[someone knocks on door. We say:] Who is it? 

https://learnenglish.britishcouncil.org/en/english-grammar/pronouns/it-and-there