你本应该是个不错的人 用英语怎么说

You should have been excellent.
You should have been an outstanding/good/excellent person.
should have表示他可能成为一个优秀的人但是事实上没有的惋惜

你本应该是个不错的人
=you're supposed to be a good man, but, you're not......

You should be a good person

you should have been a good guy~

you should have been a nice guy

you should have been a good guy~