Explanation
A verb is used to express an occurrence, action, or state. It is the grammatical center of the predicate in a sentence.
An auxiliary verb is a verb which is used in the formation of tenses, moods, tones, etc.
Option D is correct as have indicates the use of have to.
The other options are wrong as no other tense can be used here.
The correct answer is D) have to.
Option D is correct as yesterday indicates the use of had to.
The correct answer is D) had to.
We use modal verbs to show if we believe something is certain, probable or possible (or not). We also use modals to do things like talking about ability, asking permission making requests and offers, and so on.
In the given sentence, option A is correct as it signifies necessity, compulsion and certainty. It fits in the context of a rule book given to new recruits.
Option B and D are incorrect as they show that something is possible in the future, but not certain.
Option C is incorrect because we use the modal 'can' to make general statements about what is possible.
Modals are used to show that we believe something is certain, probable or possible.
Option A - Correct,as may is used to show that something is possible in the future, but not certain. It fits in the context of the sentence that the recruits are being told that they may or may not grow their hair.
Option B - Incorrect, as it shows ability.
Option C - Incorrect, as it suggestive in nature.
Option D - Incorrect, as it shows compulsion.
When we read the entire sentence, we can understand that the sentence means that a recruit may grow his hair longer but never more than the collar. Hence, words denoting compulsion are not required here.
From the given options, option A is correct as it signifies certainty. The recruits are instructed to keep their uniform clean and tidy. After reading the sentence, we can make out that we need to use a modal that implies certainty.
Option B, C and D are incorrect as :
'Could' and 'Might' imply something is possible in the future, but not certain,
and 'Would' implies condition.
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