I am playing the guitar and the violin well.这句话对否

要看你的意思

如果你的意思是：我吉他和小提琴都不错？

那就是语法的错误。应该是： Ican play guitar and vilion well.

如果你的意思是：我玩儿小提琴和弹吉他一样好，
那意思就有错误。
应该是：I can play the vilion good as well as guitar.

乐器前要加定冠词 但是不确定你时态语态对不对 要看语境
I can play....
I play...
都说得过去

好像不对，乐器前好像不要加定冠词，钢琴除外。几年没学英语了，都忘了，不确定。

I am playing with guitar and violin well
弹乐器要用play with