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Difficulty: EasyModal Auxiliaries and Expressing Modality

Complete the following sentence with the most appropriate modal verb: 'After working continuous night shifts for a week, the doctor _____ take a complete rest.' Which of the following modal auxiliaries correctly completes the sentence?

  1. A
    must to
  2. mustAnswer
  3. C
    should to
  4. D
    might can

Answer

The correct option is 'must'.
The word 'must' is a modal auxiliary verb used to express strong necessity or advice. It is correctly followed by the bare infinitive verb 'take' without an intervening 'to'.

Step-by-Step Solution

1
Identify the required grammatical function in the sentence context.
The sentence requires a modal auxiliary to express strong necessity or recommendation.
The doctor's fatigue after working continuous night shifts necessitates rest.
2
Apply the rule governing modal auxiliary verbs and main verb complements.
Standard modal auxiliaries (must, should, can, might) take a bare infinitive without 'to'. Furthermore, double modals cannot be stacked.
Modal verbs directly precede the base form of the main verb.
3
Select the grammatically correct modal verb.
The form 'must' correctly pairs with the base verb 'take'.
'Must' is grammatically accurate and fits the context of obligation/necessity.

Key Concept

Modal auxiliaries are followed directly by the bare infinitive form of a main verb (without 'to') and cannot be combined with other modal auxiliaries.
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Topics

Modal Auxiliaries and Expressing Modality

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