0 used to introduce something new that you say, especially something that is different or the opposite from what you have just said -- fakat
1 used before you say why something did not happen or is not true -- ancak
2 used to show that you are surprised about what someone has just said -- ama
'Tim is leaving.' 'But why?'
3 used to connect 'excuse me' or 'I'm sorry' with what you say next -- (özür dilemek ve araya girmek için) ama
4 except -- ... nın/nin dışında, ...den başka
5 only -- yalnız, sadece
We can but try.