Another way to say it

Dòigh eile air a ràdh

We can express ability by using the verb thèid (will come) + aig and the preposition air (on).

An urrainndhutFraingisathuigsinn?
An tèidagad / airFraingisathuigsinn?
An urrainn dhut Fraingis a thuigsinn?
Can you understand French?
An tèid agad air Fraingis a thuigsinn?
Can you understand French?

And the response

'S urrainndhomhFraingisathuigsinn.
Thèidagam airFraingisathuigsinn.
'S urrainn dhomh Fraingis a thuigsinn.
I can understand French.
Thèid agam air Fraingis a thuigsinn.
I can understand French.
An tèid agad air?
Can you/ Will you manage it?

And remember that  if discussing language ability we can use the very simple expression we learned in A1 Cuspair 12: thaagam.

A bheil Fraingis agad?
Do you have (speak) French?
Tha Fraingis agam.
I do have (speak) French.
Chan eil Fraingis agam.
I don't have (speak) French.