est-ce que - this means literally 'it is it that' so..'est-ce qu'habites-tu à Londres?' literaly translates to 'it is it that you live in London?' to say 'did you', you change the tense of the verb to the past, e.g: 'est-ce qu'habitais-tu à Londres?'

tu fait ton devoir? tu as ta liver ? انت عملت واجبك؟. انت تمتلك كتابها ودا يسمى سؤال باللهجة fait -tu ton devoir?اما دا يسمى سؤال بتقديم الفعل على الفاعل est-ceque tu fait ton devoir? ودا سؤال ايضا

I think that it's the same as English you just have to inverse verb and subject, so to say "can you help me?" you say "Peux tu m'aider?" peux is the verb and tu is the subject. do you see! it's so easy!