IV.
1. Were're excited that Nam won a scholarship
2. When I entered the room, I was surprised at what I saw
3. The rain prevented the volunteers from mowing the old lady's lawns 
4. After having done his homework, David went to bed
5. Learning how to cook is easy for anyone

Bai 2 
1. Nam won a scholarship. We are excited about that fact.
-> We’re ….  about Nam's winning/ having won a  scholarship
2. Entering the room, I was surprised at what I saw.
-> When …… When I entered the room, I was suprised at what I saw.
3. The volunteers couldn’t mow the old lady’s lawns because of the rain.
-> The rain prevented … the volunteers from mowing the old lady's lawns
4. David did his homework and the went to bed.
->  …After having done his homework, he went to bed.…………………
5. It is easy for anyone to learn how to cook.
-> Learning…how to cook is not easy……………………………

2. Having asked his mother's permission the boy went out to play.
3. Having drunk too much he didn't drive home himself
4. Having written two tests today we are very exhausted
5. Having filled the washing machine she switched it on
6. Having been to the disco the night before she overslept in the morning.
7. Having worked in the garden all day we were sunburned in the evening.
8. Not having slept for two days she wasn't able to concentrate
9. Not having seen him for ages I didn't recognize him.
10. Not having ridden a horse for a long time I found it very difficult to keep in the saddle
11. Having practiced a lot Zoe was sure of her winning in the compretition

1.Having switched off the lights we went to bed.
2.Having asked his mother's permission the boy went out to play.
3.Having drunk too much he didn't drive home himself.
4. Having written two tests today we are very exhausted.
5. Having filled the washing machine she switched it on.
6. Having been to the disco the night before she overslept in the morning.
7.Having worked in the garden all day we were sunburned in the evening.