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?
- A. signCorrect
- B. signs
- C. signed
- 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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Which choice completes the text so that it conforms to the conventions of Standard English?
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