16Hit1600
Standard English ConventionsEasy–MediumBase form after a modal

Standard English Conventions practice question

Visitors must ____ the marked trail while the ground is nesting territory.

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

  1. A. keep toCorrect
  2. B. keeping to
  3. C. kept to
  4. D. keeps to

Answer: A. keep to

After 'must', the base form: 'must keep'.

Why the other answers are wrong

B. keeping to
'Must keeping' is not standard.
C. kept to
'Must kept' is not standard.
D. keeps to
'Must keeps' is not standard.

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