1. Sam is busy, so she can’t join the course.
-> If Sam weren't busy, she could join the course.
2. They don’t know English, so they don’t understand the conversation.
-> They would understand the conversation if they knew English.
-> They don't understand the conversation because they don't know English.
3. Minh doesn’t read many English books because sh...
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3. Minh doesn’t read many English books because she doesn’t have time
-> If Minh had time, he would read many English books.
4. He plays soccer skillfully.
-> He is a skillful soccer.
5. Eating healthy food is very important
-> It is very important to eat healthy food.
6. This is the first time I have visited Hue Citadel.
-> I have never visited Hue Citadel before.
7. We save water. We won’t have to suffer from water shortage.
-> Unless we save water, we will have to suffer from water shortage.
8. He started using public transport 2 weeks ago.
-> He has used public transport for 2 weeks.
9. The last time he threw the bottles away was last Sunday.
-> He hasn’t thrown the bottles away since last Sunday.
10. My sister was going out yesterday. It suddenly rained
-> While my sister was going out yesterday, it suddenly rained.
11. The weather was so bad, but they decided to go camping.
-> Despite the bad weather, they decided to go camping.
12. Due to the noisy concert, we couldn’t sleep. (therefore)
-> The concert was noisy, therefore, we couldn't sleep.
13. “If I were you, I would take part in the summer camp”, he said to me.
-> He advised me to take part in the summer camp.
14. Global warming results in the melting of glacier. (causes)
-> Global warming causes the melting of glaciers.
15. Light pollution occurs, so we are unable to see.
-> Due to the occurrence of light pollution, we are unable to see.
