noun
definition
The time at which something happens.
example
A good article will cover the who, the what, the when, the where, the why and the how.
adverb
definition
(interrogative) At what time? At which time? Upon which occasion or circumstance? Used to introduce direct or indirect questions about time.
example
Do you know when they arrived?
definition
At an earlier time and under different, usually less favorable, circumstances.
example
He's mister high and mighty now, but I remember him when.
definition
(relative) At which, on which, during which: often omitted or replaced with that.
example
That was the day when the Twin Towers fell.
pronoun
definition
(interrogative) What time; which time.
example
Since when do I need your permission?
definition
The time that.
example
I recall when they were called the Greys.
conjunction
definition
At (or as soon as) that time that; at the (or any and every) time that; if.
example
A player wins when [as soon as, or at any time that, if] she has four cards of the same suit.
definition
During the time that; at the time of the action of the following clause or participle phrase.
example
Be careful when crossing the street.
definition
At what time; at which time.
example
I am here till Friday, when [i.e. at which time] I leave for Senegal.
definition
Since; given the fact that; considering that.
example
I don't see the point of putting up Christmas decorations when I am the only person who is going to see them.
definition
Whereas; although; at the same time as; in spite of the fact that.
example
He keeps changing things when the existing system works perfectly well.
interjection
definition
That's enough, a command to stop adding something, especially an ingredient of food or drink.
definition
Expressing impatience. (Compare what.)
Examples of when in a Sentence
When did this happen, Mom?
He had climbed many a tree when he was a boy.
When she glanced at him, he was eyeing her, a wry smile twisting his lips.
As always, he had been there when she needed him.
That served another purpose when the conversation turned to the possibility of another child.
When did it happen?
When will supper be ready?
It was past one o'clock when Pierre left his friend.
In business transactions Alex was frugal with his money, but when it came to his family, he was generous.
When it finally started down the runway, she closed her eyes.
When do I start?
To be sure, when we can get them.
I ceased making the sound "wah-wah" only when I learned to spell the word.
When the Civil War broke out, he fought on the side of the South and became a brigadier-general.
When he spoke, his voice was controlled.
So when are you getting your car?
When is it due?
But I thought when people got married...
When the snow melts they'll sink in the Polish swamps.
When he answered, his voice was gravely.
That's when she thought of it.
Let me know at once when you will start.
Mom, when will the baby be born?
It hurts him when you say... things.
Didn't you see me when you walked by?
When new technology comes out, we generally understand it in terms of what it displaces.
When I know them.
I do not remember when I first realized that I was different from other people; but I knew it before my teacher came to me.
When they passed over a field of grass Jim immediately stretched down his head and began to nibble.
When she glanced up at him, even his smile was reassuring.
I hid when this guy drove up.
I knew by the way my mother and aunt dressed when they were going out, and I invariably begged to go with them.
When she paused, Carmen yelled at her.
You're sure to like Billina, when you know her, asserted Dorothy.
When Alex came in that evening, he announced that he was making another trip to Texas.
She died when Tammy was born, didn't she?
He hated it when she won an argument.
When she opened her eyes the sun was directly overhead.
There was great applause when the speaker sat down.
When Pierre saw the Emperor he was coming out accompanied by two merchants, one of whom Pierre knew, a fat otkupshchik.
I'll be in the kitchen... when you get decent.
When the nurse arrived, she took Destiny's temperature and said something about the doctor.
You looked like a scared school girl out there when I found you.
When she did speak, her voice was filled with emotion.
When she woke again, the sun was shining on her face.
She stopped in the kitchen when she spotted the skillet of scrambled eggs and a pan of biscuits beside it.
Tonight, when it was dark, she could pretend they were at home.
When Morino rode far enough ahead so that he couldn't hear their conversation, Carmen finally spoke to Alex.
Yet when they brought her back, she was asleep.
Nor did he say anything when she exchanged the guitar for a violin and paid for lessons.