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Mr1bin Posted 15 years ago
Grammar

Must and must be

Are they interchangeable?

1. Students in my class study very hard. So they must be smart.

2. Students in my class study very hard. So they must get or be getting high grades.

Are they ok? thank you
  

Top answer

mr1bin Are they interchangeable? 1. Students in my class study very hard.

  • mr1bin Are they interchangeable?
  • 1.
  • Students in my class study very hard.
  • So they must be smart.
  • 2.
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1 Answers
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mr1binAre they interchangeable?
1. Students in my class study very hard. So they must be smart.
2. Students in my class study very hard. So they must get or be getting high grades.
"Must" and "must be" are not generally interchangeable.

The two options in your second example are two different tenses.

"Be" functions as an

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