How to pronounce these words (Modh Coinniollach)

Preparing for my Irish Oral next week. Could somebody kindly tell me how to pronounce the words in bold? Also could you tell me if the passage is grammatically correct (the spelling isn't that important as it is for the orals, but all constructive criticism is welcome).

Dá mbéarfaí orm leis an bhfón ar scoil, thabharfaí an fón go dtí an príomhoide agus ní bhfaighfeá ar ais go ceann seachtaine.

I wrote it myself so I'm not sure if it's grammatically correct (I was also unsure about the negative of gheofá).

Thanks in advance