English translation of 'कब'
1. when adverb
You use when to ask questions about the time at which things happen.
When did you get married?
'I'll be there this afternoon.' — 'When?'
2. when conjunction
You use when to introduce a clause where you refer to the time at which something happens.
I asked him when he'd be back to pick me up.
I don't know when the decision was made.
He was a student when we met.
She remembered that day when she'd gone exploring the town.
3. when conjunction
You use when to introduce the reason for an opinion or question.
How can you understand, when you don't have kids?
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Translation of कब from the Collins Hindi to English Dictionary