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