`7`. Were I not to have lots of good friends, I would get very lonely.
Đảo ngữ câu điều kiện loại 2: Were + S (to V), S + would/could + V.
`8`. If we had had enough time, we would have gone on holiday.
Câu điều kiện loại 3: If + S + had PII, S + would/could + have PII.