If you like many varieties of apples, you can say: -> My favorite fruit is an apple but I like eating many different varieties. -> My favorite fruit is …
The sentence “I like eating an apple” sounds like it’s incomplete. It should be followed by something like: “…a day/for breakfast/when I …
更多内容请点击：i like apple 不对吗，后面的apple一定要是复数吗？ - 知乎 推荐文章