Ni dheanfaimid dearmad/ni dheanfaidh muid dearmad.
Then add the following depending..... ort - you, air - him, uirthi - her, orthu - them.There's an accent (fada) on the i in ni and the e in dheanfaimid.(Can't work out how to do it on my keyboard - you'd never guess I haven't a clue about PCs, would you?)
But to be fair, you'd probably be better to check it on a translation website - it's a long time since I had to practice mo cuid gaeilge ( my command of the Irish language)!
Where are Bluedolphin and Wraith when you need them? They're normally good for this kind of stuff!