Choose the correct option to fill in the blank in the given sentence:-

If I _____ enough time tomorrow, I will finish the assignment.

have

The correct answer is Option (4) → have

The sentence is a first conditional sentence, which talks about a real or possible situation in the future. The structure is:

If + present tense, will + base verb

So the correct sentence is: "If I have enough time tomorrow, I will finish the assignment."