Fòram na Gàidhlig

'Could the boys continue' was the sentence I need to know how to say, but any help about how to say something like 'could' in Gaelic in general would be appreciated.
It's one area of the language I really have trouble with.

My Gaelic is poor, and I don't know how to ask many questions. How do I say:

'could the boys'

or

'can the boys'

Any help would be appreciated.

Tapadh leibh.