Explanation
A verb is used to express an occurrence, action, or state. It is the grammatical centre of the predicate in a sentence.
An auxiliary verb is a verb which gives is used in the formation of tenses, moods, tones, etc.
Option C is correct as will indicates the use of future tense and also, the emphasis which is expressed by have to.
The other options are wrong as no other tense can be used here.
The correct answer is C) have to
Option C is correct as missed and walk indicate the use of had to.
The correct answer is C) Had to
Option A is correct as careful indicates the use of be which suggests of a state.
The correct answer is A) be
Option B is correct as be washed indicates the use of have to. Also, the subject is plural.
The correct answer is B) Have to
Option B is correct as if and run indicate the use of not and do respectively.
The correct answer is B) don't
An auxiliary verb is a verb which is used in the formation of tenses, moods, tones, etc.
Option A is correct as the question and visit indicates the use of had to.
The correct answer is A) had to
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