初中英语see用法如题He saw her （playing/play） the piano when he passe

初中英语see用法如题He saw her （playing/play） the piano when he passe he practices playing the piano every daay为什么play要加ing而 I see when could he play the piano?翻译 When is he going to play the piano? dennis could play the piano when he was five He can play the piano. Passing by the house,he saw a girl playing the piano同义句 ____ by the house,he saw a girl playing the piano beautifull He began to play the piano when he was seven.(同义句)He( )( )th When he was five ,he started playing the piano .(改为同义句) 1.He likes playing the piano.(改为一般疑问句） likes,he,playing,piano,the怎样连字成句?