The basic rule for asking questions in English is straightforward: Invert the order of the subject and the first auxiliary verb.
It is snowing. = Is it snowing?
He can speak German. = Can he speak German?
They have lived here a long time. = Have they lived here a long time?
If there is no auxiliary, use part of the verb 'to do'.
You speak fluent French. = Do you speak fluent French?
She lives in Brussels. = Does she live in Brussels?
