2. Jane didn't join our program as she had to take a summer course
- as : bởi vì, đi với mệnh đề
3. Everyone dislike him since he behaved very rudely
- since : bởi vì, đi với mệnh đề
4. I won't be able to attend the meeting since I'll be on holiday with my family
- since : bởi vì, đi với mệnh đề
V
1. has failed
- S have/has VPII
2. established
- S V(ed/C2)
3. have they lived - moved
- S V(ed/C2)
4. have finished
- S have/has VPII
5. am studying
- S am/are/is Ving
6. did you buy - bought
- S V(ed/C2)
7. Have you ever been - haven't been
- S have/has not VPII