1. If I had free time, I would go with you.

→ Câu điều kiện loại 2: If + S + V-ed/V2, S + would/could/should + V (nguyên thể)

2. Because Tam ate a lot last night, she had a stomachache.

→ Because S + V + O, S + V + O: bởi vì

3. The three injured men had been taken to the hospital by some local people by the time the ambulance came.

→ Bị động thì QKHT: S + had been V3/Ved + by + O

→ S + V(qkht), by the time + S + V(qkđ)

4. If I turn off more lights in the house, I can reduce my eyestrain.

→ Câu điều kiện loại 1: If + thì hiện tại đơn (S + V), S + will/can/shall + V (nguyên thể)