1. He stopped the car because the traffic lights turned red

2. Jane didn't join our programme as she had to take a summer course

3. Since he behaved very ruddy , everyone dislike him

4.They do volunteer work because they like doing something useful

5. I won't be able to attend  the meeting since I'll be on holiday with my family

6. We decided to stay home and watch TV as it was raining heavily 

7. He is training hard because he wants to get fit

8. Since Sally was ill , she didn't go to school yesterday 

Since và as trong các câu trên mang nghĩa là bởi vì = Because nha bạn