conjunction

 

opposite information used to introduce something new that you say, especially something which is different or the opposite from what you have just said

I'd drive you there, but I haven't got my car.

 

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 ill.

 

showing surprise used to show that you are surprised about what someone has just said

'Tim is leaving.' 'But why?'

 

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?

 

preposition

 

except

Everyone but Andrew knows.

 

adverb

 

only

We can but try.