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English definition of “but”

but

conjunction
 
 
strong /bʌt/ weak /bət/
OPPOSITE INFORMATION A1 used to introduce something new that you say, especially something that is different or the opposite from what you have just said: I'd drive you there, but I don't have my car. The tickets were expensive, but the kids really enjoyed it.Connecting words which express a contrast
EXPLAINING WHY used before you say why something did not happen or is not true: I was going to go to his party, but I was sick.Connecting words which express a contrast
SHOWING SURPRISE used to show that you are surprised about what someone has just said: 'Tim is leaving.' 'But why?'Feelings of surprise and amazement
CONNECTING PHRASES used to connect 'excuse me' or 'I'm sorry' with what you say next: Excuse me, but would you mind shutting the door?Polite expressions
(Definition of but conjunction from the Cambridge Learners Dictionary © Cambridge University Press)
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