I didn’t know that was her birthday so I didn’t buy her a present. A. If I had known that was her birthday, I would have bought her a present. B. If I had known that was her birthday, I w

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I didn’t know that was her birthday so I didn’t buy her a present.

If I had known that was her birthday, I would have bought her a present.

If I had known that was her birthday, I would haven’t bought her a present.

If I had known that was her birthday, I would buy her a present.

If I had known that was her birthday, I wouldn’t have bought her a present.

Giải thích

Câu gốc đang diễn tả thực tế ở quá khứ

=> Dùng câu điều kiện loại 3 để đưa ra giả thiết trái ngược quá khứ

Cấu trúc: If + S + had + Ved/V3, S + would/could/might + have + Ved/V3

Tạm dịch: Tôi không biết đó là sinh nhật của cô ấy nên tôi đã không mua quà cho cô ấy.

=> A. Nếu tôi biết hôm đó là sinh nhật của cô ấy thì tôi đã mua quà cho cô ấy rồi.

Choose A.