"我最喜欢吃香蕉"用英语怎么说

分情况而定。
如果你一直都最喜欢吃香蕉，那么应该用
I like eating banana best.
或者 My favourite is banana.
如果你兴趣经常变化，短时间的最喜欢吃香蕉，那么应该用
I like to eat bananas best.
或者 My favourite is banana.

有两种说法意思一样--用复数：I like bananas best.
用单数：Banana is my favourite fruit.

My favourate fruit is banana.
或
I like eating banana best.

No body likes banana more than I do.

I like banana best.