I am not so good at singing.And I can't sing in the show.只选择一个(so、and、but、or)那就不要so，因为它可用可不用。
I am not good at singing. And I can't sing in the show.可以这样吗？I am not good at singing so l can’t sing in the show．也可以。用and是并列关系，用so是因果关系。还是用so更恰当些。
I am not good at singing so l can't sing in the show.