1.Mrs Li was shopping (shop) at this time yesterday.
2.Look!Those boys are piaying (play) basketball on the playground.
3.It was raining (rain) the whole morning yesterday.
4.Listen!Some girls are singing (sing) in the classroom.
5.The students were writing(write) when the teacher came in.
6.While the twins were listening (listen) to music,someone knocked at the door.
7.All of us are studying (study) hard for the coming examination these days.
8.He was reading (read) a novel at eight yesterday evening.
9.They are taking(take) photos on the Great Wall now.
10.What are you doing (do) when the UFO arrived?
11.He does well (good) in English.
12.She is better at singing than dancing (dance).
13.The boy had a hard time in mending (mend) the car.