Question

Fill in the blank with a suitable modal auxiliary denoting a suggestion:

You _____ call Paul first before planning to visit him.

• A. shall
• B. can
• C. should
• D. will

Answer 1

The correct option is C should

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.

The given sentence is firstly set in present tense and secondly it expects a mood of advice in order to visit Paul.

Option C is the correct answer because it expresses an advice regarding what is correct.

Whereas option A expresses something which will be done in future;

option D expresses the same as option;

option C expresses ability which is not appropriate in the given sentence.