running on the playground为什么是on

on the running machine是什么意思? running on the playground为什么是on The boys are running on the playground 有什么错误 the boys are running on the playground.用yesterday改写 The girl is running on the playground.对is running提问 the girl is running on the playground谢谢了,大神帮忙啊对is running 提问 There was a traffic accident on the road.The crowd______towards it.选项：A.are running B.is running C.were running D.was running But sometimes there are many cars running on the road,为什么要用running? A rabbit is run还是running on the grass? He is running fast on the playground 变成感叹句 Look Some boys and girls are running on the . They are running _____ the trees up into on of What kind of chicken running on the road 如何理解“the play of light on running water”? Is Sam running on the train?什么意思 keep on running ( )There have a football game in the playg( )There have a football game in the playground.改错 找出下面句子中的错误并改正1.When do Peter go and see his griends?2.We often surfs the Internet on Sundays.3.We are going to went to the cinema to watch a film.4.My friend Tim is good at swim.5.The students are play basketballin the playg