Which of the following sentences correctly uses the conditional tense?

Question

A. If the library had been open, I will borrow a book.
B. If the library were open, I will borrow a book.
C. If the library is open, I would have borrowed a book
D. If the library is open, I will borrow a book

Answer 1

The sentence that correctly uses the conditional tense is:

D. If the library is open, I will borrow a book.

This sentence uses the present simple tense "is" in the conditional clause and the future simple tense "will borrow" in the main clause, which is the correct structure for a first conditional statement.

The other options have incorrect tense usage for the conditions they present.