动词-ing 改写下列句子

1。The teacher is taking a walk on the playground is our teacher of English。正在操场上散步的老师是我们的英语老师。2The birds singing in the trees filled the air with music 。小鸟正在树上唱歌,使空气弥漫着音乐。3。Do you know the number of students coming to the English Evening。你知道即将来英语晚会的学生的数量吗?4。I could hear the boys playing in the field。我可以听到男孩们正在田野里玩耍。5。He was glad to find the fire burning brightly。他非常高兴找到了正燃烧地发亮的火焰。6。I watched them dancing。我看着他们跳舞。7。Mary sat on the ground,talking with Jane。Mary坐在地上,正与Jane聊着天。8。I stood at the gate waiting for his arrival。我站在门口等待着他的到来。10。Seeing that it was raining John put on his raincoat。看见正在下雨,John穿上了他的雨衣。11。Stepping carelessly off the pavement,he was knocked down by the bus。不小心走出了人行道,他被一辆公车撞了。