Question

I like onions, They are good for me这一句对吗？

Answer 1

不对，一个句子不滚配雀能有两个大早谓语，因此可以改为并列句，即把逗号换为and. 或者改为定卖或语从句，即I like onions which are good for me.

Answer 2

对
I like onions, they are good for me.
我喜态携欢携改洋葱，辩闭判它们对我有益。