en > eu 
/bʌt/
1 conj. baina
it's raining but it's quite mild: euria ari du baina giro ona dago
he didn't eat two but three: bi ez baizik hiru jan ditu
I watched all the films but one: film bat ez beste guztiak ikusi nituen
4 prep. baino
she has no one but her son: bere semea baino ez du
5 adv. soilik, besterik
we can but try: ahalegintzea besterik ez dugu