Respostas
1- We were cycling when the rain started.
2- He was breaking the vase while he was playing ball at home.
3- My mum was coming in while I was surfing on the net.
4- The electricity was going off as I was baking a cake.
5- Sandra caught her sister when she was falling down the stairs.
6- I was playing golf when it began to rain.
7- While she was reading a novel, her sister turned on the CD player.
8- They were walking along the beach when they saw the accident.
9- We were studying when we heard a terrible noise.
10- While she was doing the ironing, her husband set the table.
11- We were dancing when he fainted.
12- When he was falling down the tree, he broke his leg.
13- I was shocked when I heard the bad news.
14- She was crying when I saw her.
15- My parents were sitting in the garden while we played badminton.
16- Were you swimming in the sea at 6:00 am?
17- Bob was lying in the garden when it started to rain.
18- As I was putting the baby to bed, the phone rang.
19- What were you doing when Dan felled?
20- How did you break the window?
21- I was writting an e-mail when the postman delivered his letter!
22- When I was leaving home yesterday, some dogs were sitting near the front gate.
23- John didn't swim at four o'clock. He was playing football.
24- While I was swimming in the river, I saw some frogs.
25- Jim didn't pay attention when he drove his car into a tree.
26- What were you doing while she was slept?
27- Everyone was sleeping when the robbers broke in.
28- We arrived at the station just as the train was leaving.
Espero ter ajudado, tenha excelentes estudos! <3