Ther likea bananas,but ther does not want any now这句话有什么不对？

改成：

They like bananas, but they don't want any now.

错误就是they，like a，does。

原句拼写多处有错，应该为

They like bananas, but they does not want any now.

they是复数名次，谓语动词不应该用三单形式

所以应该将does not 改成do not

也就是They like bananas, but they does not want any now.

他们喜欢吃香蕉，不过现在不想吃。