playing为什么不用双写y如题

playing为什么不用双写y如题 为什么用by playing 而不用through playing句意为：通过打羽毛球.为什么开头用by playing badminton,却不用 through playing badminton? Did you hurt yourself playing basketball?为什么不用play basketball? Don't spend your free time playing computer games.句子中playing为什么不用原形play? Playing basketball is good for you.为什么用playing 不用play Look!There are a lot of children playing in the ground.为什么要用playing而不用are playing answer改成过去式,为什么不用双写? know现分词为什么不用双写? Does she practice playing guitar every day play为什么不用原形?如；Does she have apple?have用了原形.何时in+the+.,何时in+. 什么句子不用be动词和助动词?everyone in our class likes playing soccer 这个句子为什么没有be动词和助动词?要自己写的 如题所说 需要3个句子 不用太长：描写环境的句子,并说明为什么这样写好 health在什么情况下要加y,什么时候不用如题 如图为什么不用b 如题.不用写序号,只要符号和中文. Where are you playing football为什么用are?为什么用be动词而不用助动词？ 为什么鱼在水里睡觉不用闭上眼睛?如题 have got=have?为什么不用get?如题. I had no other choice 为什么不用choices如题