UK:*UK and possibly other pronunciationsUK and possibly other pronunciations'IN': /ˌaɪˈɛn/; 'in': /ˈɪn/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ɪn/ ,USA pronunciation: respelling(in)

Inflections of 'in' (v): (⇒ conjugate)
v 3rd person singular
v pres pverb, present participle: -ing verb used descriptively or to form progressive verb--for example, "a singing bird," "It is singing."
v pastverb, past simple: Past tense--for example, "He saw the man." "She laughed."
v past pverb, past participle: Verb form used descriptively or to form verbs--for example, "the locked door," "The door has been locked."
WordReference Collins English Usage © 2020
used for saying where something is
You use in as a preposition to say where someone or something is, or where something happens.
Carlos was in the bath.
I wanted to play in the park.
In New York we saw the Statue of Liberty.
In is sometimes used with superlatives.
The Ueno Zoo is the oldest zoo in Japan.
His company is one of the biggest in the world.
used for saying where something goes
You use in as an adverb to say that someone goes into a place, or that something is put into a container.
Someone knocked at the door, and Hana called ‘Come in!’.
She opened her bag and put her phone in.
In is sometimes a preposition meaning into.
She threw both letters in the fire.
➜ See into
used with expressions of time
In is often used with expressions of time.
You use in to say how long something takes.
He learned to drive in six months.
The food was all eaten in a few minutes.
You also use in to say how long it will be before something happens in the future.
In another hour it will be dark.
You use in to say that something happens during a particular year, month, or season.
In 1872, there was a terrible fire in Chicago.
Her birthday is in April.
We plan to go camping in the summer.
You use in with the to say that something happens regularly each morning, afternoon, or evening.
I often go swimming in the morning.
Dad used to sit there in the evening and listen to the radio.
➜ See morning
➜ See afternoon
➜ See evening
Don't say ‘in the night’ to mean that something happens regularly each night. Use at night.
There were no lights in the street at night.
➜ See night
Be careful
Don't say that something happens ‘in’ a particular day or date. Say that it happens on that day or date.
On Tuesday they went shopping.
Ali was born on April 10th.
Be careful
American speakers sometimes omit the on.
I'm going to a party Wednesday.
Be careful
Don't say that something lasts or continues ‘in’ a period of time. Say that it lasts or continues for that time.
I have known you for a long time.
I worked for the same company for ten years.
➜ See for
meaning ‘wearing’
In is sometimes used when saying what someone is wearing.
The bar was full of men in baseball caps.
➜ See wear
Be careful
Don't use ‘in’ when you are talking about someone's ability to speak a language. Don't say, for example, ‘She speaks in Russian’. Say ‘She speaks Russian’.
'in' also found in these entries:

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