xiaoyong playing footbaii这句哪里不对?

Xiaoyong is playing football .
现在进行时要用系动词：is

这句话有主语和宾语，但是缺少谓语动词，你可以说成是xiaoyong is playing football.或者xiaoyong likes playing football.主语正在或者喜欢踢足球，二者均可。
understand？！

xiaoyong is playing football是正确的 首先你没有系动词 is 足球football不是footbaii

Xiaoyong likes play football.