复数变成单数，单数变成复数的英语句子

LS的杂那么多错误啊？我借你的帮你修改一下。
I have an apple变成We have some apples.
We have some basketballs变成 I have a basketball
You have a watch变You have some watches
They can speak many words变He（She）can speak a word.

I have an apple变成We have some apple
We have some basketballs变成 I have a basketball
You have a watch变You have some watch
They can speak many words变He（She）can speak a English