Bài Làm :

1. We switched off the lights before we went tobed.

 -> Having switched off the lights we went to bed.

2. She had not slept for two days and therefore wasn't able toconcentrate.

 -> Not having slept for two days, she wasn't able to concentrate.

3. Since I had not seen him for ages, I didn't recognizehim.

 -> Having not seen him for ages, I didn’t recognize him.

4. I had not ridden a horse for a long time and found it very difficult to keep in the saddle.

 -> Not having ridden a horse for a long time, I found it very difficult to keep in the saddle.

5. She had been to the disco the night before and overslept in themorning.

 -> Having been to disco the night before, she overslept in the morning.

1. Having switched off the lights,....

2. Having asked his mother's permission,...

3. Having drunk too much,...

4. Having written two tests today,.... 

5. Having filled the washing machine,.....