Select the appropriate verb forms to fill in the blanks in the given sentence:-

If I ____ to renew the books, I ____ to pay a fine.

had phoned, wouldn't have had

The correct answer is Option (2) → had phoned, wouldn't have had

The completed sentence is: If I had phoned to renew the books, I wouldn't have had to pay a fine.

This structure uses the Third Conditional (or Past Unreal Conditional). It is used to talk about a hypothetical situation in the past and its hypothetical result in the past.

1. If-clause (Condition): Uses the Past Perfect Tense (had + past participle).

   • If I had phoned (I didn't phone, so this is contrary to past fact).

2. Main Clause (Result): Uses would/could/might + have + past participle.

   • I wouldn't have had (I did have to pay a fine, so this is contrary to past fact).

The sentence conveys regret or a reflection on a past missed opportunity: "Because I did not phone, I had to pay a fine."