ngữ câu điều kiện loại 1: Should + S + Vo, S + Will +Vo If he has free time, he’ll play tennis. Should he have free time, he’ll play tennis 2. Đảo ngữ câu điều kiện loại 2: Were + S + to + Vo, S + Would + Vo If I learnt Russian, I would read a Russian book. Were I to learn Russian, I would read a Russian book 3. Đảo ngữ câu điều kiện loại 3: Had + S + V3/Ved, S + Would have + V3/Ved If he had trained hard, he would have won the match. Had he.