Tom was playing ping-pong 〔when I left〕对划线部分提问

对画线部分提问（Tom was playing ping-pong when l left.)Tom was playing ping-pong when l left.-------------------- ----- Tom ----- ping-pong?关键是时态啊,用while还是when? Tom was playing ping-pong 〔when I left〕对划线部分提问 tom was playing computer games（ ）. 什么时候要加ing,如:Tom and Mike like playing ping-pong. Tom likes playing ping-pong,and he is a f___ of Wang Hao Tom was seen playing on the playground是什么? Tom was interested in playing computer games before.(同义句)Tom--- --- be interested in playing computer games . Let's go and ()playing ping pongplaying the ping pongto play ping pongplay ping pong理由 Tom was ____(hurt) while he was playing soccer.And now his cut is ____(hurt) Tom,along with three other boys was seen playing football a moment ago 为什么用WAS When I first saw Jerry,he was playing with Tom.改为同义句When I saw Jerry___ ____ _____ _____,he was playing with Tom playing ping pong with my friends ()fun _______ Tom _______ at three yesterday afternoonA would,play footballB Is ,playing footballC Has ,played footballD Was,playing football i like playing the piano,playing ping-pong and swimming 求英语句子翻译When Lang was two years old he saw Tom playing the piano Was Tom playing the piano when you came in?否定回答_____,he______ While Tom was playing with the balloon,he saw a plane ___ (fly) over his head. Tom started playing for his national team when he was seventeen.(同义句）=Tom started playing for his national team _______ ______ ________ _________ _________.