Question

Fill in the blank with a suitable modal auxiliary with the help of the hint given in the bracket:

(impossibility in the past).

That restaurant ______ be very good. It's always empty.

• A. can't
• B. mustn't
• C. couldn't
• D. won't

Answer 1

The correct option is C couldn't

Modal Verbs show us the attitude of the speaker to what is being said or done. The term "modal" means expressing mood and mood is a way to express the attitude of the speaker.

Option C is the correct answer because it suggests impossibility in the past.

Whereas option A expresses inability in the past;

Option B suggests something which is not supposed to be right or good;

option D suggests something which is not going to be good or right in future.