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

Standard English Conventions practice question

All visitors must ____ in at the reception desk on arrival.

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

After the modal 'must', the verb takes its base form: 'must sign'.

Why the other answers are wrong

B. signs
'must signs' adds an -s the modal doesn't allow.
C. signed
'must signed' mixes a modal with a past form.
D. signing
'must signing' isn't a standard form.

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