can you sister play volleyball 为什么play不加s

Tom and his sister play volleyball.这里的play要加s Can you find who can play volleyball? He can play these ball games very well.里面的play为什么不加S? can you play volleyball?中文什么意思 play the piano为什么不加s Play the druns为什么加s?而Play the piano不加? I can't play volleyball.I______play volleyball. Nither of us plays volleyball well.中play为什么要加s Let's play volleyball,shall we/will you/do you? But he doesn't play sports 为什么play不加s（play不是第三人称加s吗)?为什么spor Jim can play volleyball well.play volleyball 划线. then let s play volleyball? I like playing volleyball为什么play要加ing?