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Anonymous Posted 12 years ago
Grammar

Modal Auxilary Verbs

Why does the tense change when using must?
Examples:
A body must consist of sentences .......
A body consists of sentences ........
If anybody can share the rule, that would be great.
  

Top answer

It's not the tense that changes. In your first sentence, 'consist' is a bare infinitive, which is what is necessary after modals. In your second sentence, 'consists' is present simple.

  • It's not the tense that changes.
  • In your first sentence, 'consist' is a bare infinitive, which is what is necessary after modals.
  • In your second sentence, 'consists' is present simple.
  • While both sentences are grammatically correct, they don't mean much.
  • A 'body' cannot 'consist of sentences'.
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2 Answers
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It's not the tense that changes. In your first sentence, 'consist' is a bare infinitive, which is what is necessary after modals. In your second sentence, 'consists' is present simple.

While both sentences are grammatically correct, they don't mean much. A 'body' cannot 'consist of sentences'.
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AnonymousWhy does the tense change when using must?
That's not considered a change of tense. must consist is the correct grammar, not musts consist or must consists.

Modal verbs like may, might, must, can, etc. don't take an s in the present tense the way other verbs do.
Modal verbs are always followed by a plai

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