From Longman Dictionary of Contemporary Englishitit1 /ɪt/ ●●●S1W1 pronoun [used as subject or object]1XXused to refer to a thing, animal, situation, idea etc that has already been mentioned or is already known about‘Where’s your office?’ ‘It’s on the third floor.’I love the spring – it’s a wonderful time of the year.There were people crying, buildings on fire. It was terrible!Don’t blame me. It wasn’t my idea.This little beast is a lemur and it lives in Madagascar.2NOWused to refer to the situation that someone is in now, or what is happening nowI can’t stand it any longer. I’m resigning.How’s it going, Bob? I haven’t seen you for ages.And the worst of it is the car isn’t even paid for yet.Stop it, you two. You’re just being silly.3XXused as the subject or object of a verb when the real subject or object is later in the sentenceIt worries me the way he keeps changing his mind.What’s it like being a sailor?Apparently it’s cheaper to fly than to go by train.It’s a pity you couldn’t come.It seems that we are not welcome here.I found it hard to concentrate.4XXused as the subject of a sentence when you are talking about the weather, the time, a distance etcIs it still raining?It was 4 o'clock and the mail still hadn’t come.It’s my birthday today.It’s over 200 miles from London to Manchester.It gets dark very early in the winter.It’s three years since I last saw her.5EMPHASIZEused with the verb ‘be’ to emphasize that you are talking about one particular thing, person, group etc and not any otherIt’s Lawrence you should be talking to.It was malaria that killed him.It was in New Zealand that Elizabeth first met Mr Cronje.
6BABY/HAVE A BABYused to refer to a baby when you do not know what sex the baby isWhat will you call it if it’s a boy?7a)used to say who a person is‘Who’s that over there?’ ‘It’s Robert Morley.’b) spoken used to say who is speaking, especially on the telephoneHello, it’s Frank here.It’s all right, it’s only me.8informal used to refer to sexHave you done it with him yet?9 →if it wasn’t/weren’t for somebody/something10informal a particular ability or quality that is needed in order to do somethingIn a job like advertising, you’ve either got it or you haven’t!11 →this is it12 →that’s it13 →think you’re it
Examples from the Corpus
it• And that's the end of it?• I'm sorry, but you just don't have it as a singer.• Itcosts $12 just to get in the door.• How's it going, Bob?• Since it happened to be such a nice day, they went to the beach.• So, did you two do it last night?• What's it like living in Miami?• It looks like they've left without us.• With the new stereo in the car, it makes a bigdifference.• In the summer, it must be beautiful there.• It's a nice camera.• It's a three-hour drive to Boston.• It was Jane who paid for the mealyesterday.• Do you like my tie? It was on sale.• It was sprinkling when we came in.• It was the meal that Jane paid for yesterday.• It was yesterday that Jane paid for the meal.itit2, It adjective informal →it bag/dress/shoes etc