16Hit1600
Standard English ConventionsEasy–MediumBase verb after 'must'

Standard English Conventions practice question

Every visitor must ____ in at the desk before going upstairs.

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A. signCorrect
  2. B. signs
  3. C. signed
  4. D. signing

Answer: A. sign

A modal takes the base form.

Why the other answers are wrong

B. signs
Present tense form after a modal.
C. signed
Past form after a modal.
D. signing
Not a finite form after a modal.

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