when

Meaning of when in English

Conjunction

1. at or during the time that; at the moment that

I will see you when I return.

2. as soon as

When the teacher opened the door, the pupils stopped playing and laughing at once.

3. after

Can I borrow that book when you've finished it.

4. although

The waiter brought me beer, when I had asked for whisky.

5. if; in the case that

What am I to do when she refuses?

6. every time that; whenever

You can come to talk to me when you are in trouble.

7. being what time it may be

Die when you will, I will with you.

8. since

I cannot go when I haven't been invited.

Interrogative adverb

1. at what time

When do you get up? ー What time do you get up?

Interrogative pronoun

1. used to ask about the time of an event etc.

"When is your birthday?" "It's March 26."

Relative adverb

1. ｟in restrictive use｠ at or on which

I don't know the time when she will arrive.

2. ｟in non-restrictive use｠ at that moment; and just then; and then

I saw her in July, when she was in Australia.