S + V + O + …….IF + S + HAD + V3/ED….., S + WOULD/COULD + HAVE + V3/ED...

1. - DE KIEM TRA CHAT LUONG CUOI NAM
DE KIEM TRA CHAT LUONG CUOI NAM
1. Form:Active: S + V + O + …….If + S + had + V3/ed….., S + would/could + have + V3/ed….Passive: S + be + V3/ed + (by O) + ……