Rule :10

[If+Present Indefinite Tense,Future Indefinite Tense]

[If+Past Indefinite Tense, Subject+would+Present form of verb]

[If+Past Perfect Tense, Subject+would have+Past Participle form of verb]

If some one had not mentioned her name I hardly think I (recognize) her.

Answer: If some one had not mentioned her name I hardly think I would have recognized her.

If I (try) I would have succeeded.

Answer: If I had tried, I would have succeeded.

If you had read the book, you (learn) many things.

Answer: If you had read the book, you would have learned many things.