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Difficulty: EasyModal Auxiliaries and Expressing Modality

Read the sentence below:
'All candidates _______ present a valid identification slip before entering the examination hall.'

Which modal auxiliary verb correctly completes the sentence to express mandatory obligation?

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

Answer

The modal verb 'must' correctly completes the sentence to express compulsory obligation.
The verb 'must' expresses compulsory obligation and correctly pairs with the bare infinitive verb 'present'.

Step-by-Step Solution

1
Identify the intended communicative function of the sentence.
The context requires expressing an official, mandatory rule for examination candidates.
Mandatory conditions and official regulations require a modal verb of strong obligation.
2
Evaluate the grammatical structure required for modal verbs.
'Must' is a modal auxiliary verb expressing obligation that takes a bare infinitive ('present').
Primary modal auxiliaries in Standard English are followed by the base verb without 'to' and cannot take inflectional endings or combine with other modals.

Key Concept

Modal Auxiliaries and Expressing Modality
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Topics

Modal Auxiliaries and Expressing Modality

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