I like apples.为什么apple加s

I like apples.为什么apple加s 为什么one kilos of apples中apple要加s I like apple,apple为什么不用加an I like apples.she likes apples.第二句中like 为何加s I like apples.__,let‘s have apple.__处填什么? Do you like apples?为什么名词要加S I like apple.和 I like apples.哪个才对? 是I like eating apple还是I like eating apples 是I like apples best 还是 I like apple best 为什么是One or two apples apple为什么要加s呢,不是还有one么 I would like some apple对some apples提问 I like apples and my sister likes apple,( )