Bob's lonely because it's difficult for him to make firends.的同义句是什么、?

问题描述:

Bob's lonely because it's difficult for him to make firends.的同义句是什么、?
=Bob's lonely because he ______ ______ at making firends.紧急情况、快点、谢谢啦!

Bob's lonely because he isn't good at making firends
be good at doing=does well in doing sth都是擅长做某事的意思