Questions & Answers about Da gaske kake magana?
Da gaske is an idiomatic expression meaning really, truly, or seriously. In this sentence, it gives the sense of Are you serious? or Do you really mean that?
Literally, gaske is connected with truth or reality, but you should learn da gaske as a set phrase.
Often da can mean with, but in da gaske it is best treated as part of a fixed expression. So you should not try to translate the sentence word-for-word as with truth you are speaking in normal English.
A more natural understanding is simply really / truly / seriously.
This is one of the most common learner questions.
Kana magana means you are speaking / talking in a basic statement. But when Hausa puts something in front for focus, such as da gaske, the verb phrase changes to a different form. That is why you get:
Da gaske kake magana?
rather than:
Da gaske kana magana?
So kake is the form expected after this kind of fronted, focused expression.