“Didn’t you buy” vs. “Don’t you buy it”: Understanding the Difference in English

'Didn't you buy' is a question asking if someone made a purchase. Example: 'Didn't you buy a new car?'

'Don't you buy it' is a statement suggesting the person regularly purchases something. Example: 'Don't you buy coffee every morning?'

你没买吗' 是一个询问某人是否购买了某物的问题。例如： '你没买新车吗？'

'你不买它' 是一个陈述，暗示这个人经常购买某物。例如： '你不每天买咖啡吗？'