学不学呀用英语怎么说

学不学呀 is a colloquial way of asking whether someone is studying or not. In English, this could be translated as "are you studying?" or "are you in school?" The origin of this phrase is not clear.
Here are some example sentences in English and their translations in Chinese:
Are you studying? 你在学习吗？
Are you in school? 你在上学吗？
I'm not studying right now. 我现在没在学习。
She's still in school. 她还在上学。