If you had not helped me, I _______ in the examination.

- প্রদত্ত প্রশ্নের সঠিক উত্তর হচ্ছে would have failed.

• If clause এ যদি (had + V3) হয়, তবে পরবর্তী clause এ would/could/might + have + V3 + extension ব্যবহৃত হয়।
- এটাকে Third conditional বলা হয়।
- আবার Conditional sentence- এ Had + Sub + V3 + Extension. এভাবে কোন Sentence শুরু হলে সেটিও Perfect conditional/ 3rd conditional হয়।
Example:
- If you had not helped me, I would have failed in the examination.
- If you had come earlier, you would have found a good seat.
- If you had started earlier, you would not have missed the train.
- Had I been a king, I would have helped the poor.

Source: A Passage to the English Language, S.M Zakir Hussain.