动词-ing 改写下列句子
1.The teather is taking a walk on the playground .he is our teacher of English
2.The birds filled the air with music .They were singing in the trees
3.Do you konw the number of students They are coming to the English evening
4.I could hear the boys .They were playing in the field
5.He was glad to find the five .It was burning bringhly
6.I watched them .They were dancing
7.Mary sat on the ground .She talked with jane
8.I stood at the gate .I was waiting for his arrival
10.John put on his raincoat because he saw that is was raining
11.As the was stepping carelessly off the pavement he was knocked down by the bus
(并将句子翻译)