1.They\play\chess\when\he go in 2.while\I\eat\lunch\the cat\jump over 3.the teacher\come\into the room\while\we\play\cards 4.the secretary\work\when\the boss\phone 5.while\the mechanic\repair\the car\the man\call him 6.when\I\wait\for the bus,I\meet\my old friend 7.he\drive\to work\when\the car\break\down 8. when\they\learn\english,the lights\go\out 9.when\the vet\examine\the dog,it\bank giúp mình vs ạ mai mình phải nộp bài cảm ơn !!!

1.They\play\chess\when\he go in.

->They were playing chess when he went in.

2. While\I\eat\lunch\the cat\jump over.

->While I was eating lunch, the cat jumped over. 

3. The teacher\come\into the room\while\we\play\cards.

->The teacher came into the room while we were playing cards.

4. The secretary\work\when\the boss\phone.

->The secretary was working when the boss phoned.

5. While\the mechanic\repair\the car\the man\call him.

->While the mechanic was preparing the car, the man called him.

6. When\I\wait\for the bus, I\meet\my old friend.

->When I was waiting for the bus, I met my old friend.

7. He\drive\to work\when\the car\break\down.

-> He was driving to work when the car broke down.

8. When\they\learn\english,the lights\go\out.

->When they were learning English, the lights went out.

9. When\the vet\examine\the dog\it\bank

-> When the vet was examing the dog, it was banking?