Do you like 不懂啊

Do you like 不懂啊 为什么可以主语开头问句?看英文电影,为什么有的问句直接是主语开头啊?例如You like this Do you like this 不懂, Do you like peaches 的peach后为什么要加es?到现在也搞不懂! do you like apples? Do you like swim? Do you like Do you like English? Do you like English? do you like apple? Do you like pop how do you like . Do you like orange? Do you like bananas do you like Do you like English? DO YOU LIKE APPLE do you like Do you like pets?