With those darned diacritial marks the phrases I've heard the most are:

Dún do bhéal(pronounced, DOON duh VAY-ul)

The plural for that would be:

Dúnaigí bhur bhéil, (DOON-uggy wur VAY-ul)

or:

Bí i do thost (pronounced, BEE ih duh HUST)

The plural for that would be:

Bígí i bhur dtost (pronounced, BEE-gee ih wur DUST)

Brían

Mere student of Gaeilge that I am.