"Do you want toothpaste?"
Translation:An dteastaíonn taos fiacla uait?
When do you use "teastaíonn" and when not? "Ta uisce uaim"means "I want water" so why do we have to add "dteastaíonn" here for the same meaning? I thought it meant "I need"
Can you not say 'an bhfuil taos fiacla ag teastáil uait?' I would have sworn i learned it that way...
I'd say that's more 'Are you wanting/needing toothpaste?'. You can, however, say An taos fiacla uait or An bhfuil tú ag iarraidh taos fiacla, both of which would be used in Connemara, whereas the one above would mean 'need'.
Is "ba mhaith leat" not acceptable here for "do you want?" I always thought "ba mhaith le..." was interchangeable with "do you want" and "would you like".
Ba mhaith leat … means “You would like …”, and is only used for a statement, not for a question. Its interrogative form would be Ar mhaith leat … ?.
Although they express the same request, “Would you like … ?” and Ar mhaith leat … ? are more polite than “Do you want … ?” and An dteastaíonn … uait? are, and so aren’t completely interchangeable in all situations.