Question

Fill in the blank with the correct auxiliary verb from the choices given.
You __________ not to talk while the teacher is teaching.
a) could
b) may
c) have
d) ought

Answer 1

Hint: A verb is a content word that denotes an action, occurrence, or state of existence. The verb is the word class that serves as the predicate of a sentence.

Complete answer:
The given sentence indicates that a certain instruction is being given, and certain permission is being denied.
Let us thus analyze the options given to us in this question-
Option (a.), 'could', is used to show the possibility that something might happen.
Therefore, option (a.) is incorrect as a possibility is not being discussed here.
Option (b.), ‘may', refers to have permission to, be allowed. It is used in granting permission and in questions to make polite requests. Therefore, option (b.) is correct as the lack of permission to talk is being correctly described by ‘may’.
Option (c.), ‘have', refers to have or possess, either in a concrete or an abstract sense.
Therefore, option (c.) is incorrect as ownership or possession is not being discussed here.
Option (d.), ‘ought', is used for indicating duty or obligation. Therefore, option (d.) is incorrect as no duty or obligation is being discussed here.

Note:
In this question, it will be helpful for the student to recall the concept of auxiliary verbs. An auxiliary verb is a verb that combines with another verb in a verb phrase to help form tense, mood, voice, or condition of the verb it combines with.