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6. A. I will never mention
- ĐK loại 1: If + S + V (HTĐ), S + will + V
7. B. wouldn't have made
- otherwise = ĐK loại 3
- Câu ĐK loại 3: If + had + V3/ed, S + would have + V3/ed
8. B. answer
- ĐK loại 1: If + S + V (HTĐ), S + will + V
- Unless =  If not
9. A. would have never believed
- Đảo ngữ ĐK loại 3: Had + S + V3/ed + O, S + would have + V3/ed
10. C. hadn't agreed
- Câu ĐK loại 3: If + had + V3/ed, would + S + have + V3/ed
11. A. would read 
- S + V2/ed (QKĐ) + as though + S + had V3/ed (QKHT)
12. A. had studied
- Câu ĐK loại 3: If + had + V3/ed, S + would have + V3/ed
13. C. could lend
- ĐK loại 2: If + S + V2/ed (QKĐ), S + would/could/... + V
14. A. comes  
- ĐK loại 1: If + S + V (HTĐ), S + will + V