1)The teacher is taking a walk on the playground. He is our teacher of English.
-----The teacher taking a walk on the play ground is our teacher of English.
2)The birds filled the air with music. They were singing in the trees.
-----The birds singing in the trees filled the air with music.
3) Here is a novel. It was written b Lu Xun.
-----Here is a novel written by Lu Xun.
4) The language is English. It is spoken in Australia.
-----The language spoken in Australia Is English.
5) Do you know the number of students? They are coming to the English Evening.
-----Do you know the number of students coming to the English Evening?
6) I could hear the boys. They were playing in the field.
-----I could hear the boys playing in the field.
7) He was glad to find the fire. It was burning brightly.
-----He was glad to find the fire burning brightly.
8) I watched them. They were dancing.
-----I watched them dancing.
9) I saw a man. He was banging at your door
-----I saw a man banging at your door.
10)Tom rushed into the room. He was covered with snow.
-----Tom rushed into the room, covered with snow.