play on the swings swing为什么要加s

play on the swings swing为什么要加s play on the swing的中文 I like _____(play) on the swing Shall we play on the swing?的同义句 My friends can play on the swing.(否定句） helped,swing,play,he,me,on,the(连词成句) The children play on the swing happily.(对话县部分提问,在play on the The children play on the swing happily.（划线提问)划线部分是：play on t play the piano为什么不加s Play the druns为什么加s?而Play the piano不加? She's on a swing?(对on a swing回答) 怎样把garden,play,and,the,we,swing,shall,go,on,the,in连词成句 为什么play后面要加s