task 6

9. Since  she'll do some work for charity next Saturday, she won't be able to go on a picnic

Since+ mệnh đề chỉ nguyên nhân, mệnh đề chỉ kết quả

10. The city dwellers felts interested in volunteer work in the rural community 

feel+ dj: cảm thấy tnao

task 7

1. While=> when

S+ was/were+ Ving+ when+ S+ Ved

2. looked=> was looking

qktd: S+ was/were+ ving=> hđ đang diễn ra trong qk

3. so=> bỏ

đã có when ở đầu câu