one qn on sentence structure:
Khi nào bạn cùng mẹ của bạn nấu ăn?
is that ok?
I think it sounds almost so natural as 'When do you with your mother cook?'...
Can you use voi instead of cung?
I suppose, yes. You could try?
Are there different places to use cùng/với/bằng? This example counted bằng incorrect for me.