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Jasminn Posted 11 years ago
Grammar

Are these sentences OK? If not, why not?

Hello. I don't know these sentences are OK or not.
1. you must not smoke until 20 years old.

2. You must not smoke under 20 years old.

If it's wrong, I want to know the reason and better way to say. Thank you.
  

Top answer

Jasminn . I don't know these sentences are OK or not. 'Must' is wrong: it suggests an internal compulsion.

  • Jasminn .
  • I don't know these sentences are OK or not.
  • 'Must' is wrong: it suggests an internal compulsion.
  • Your other structure is OK, but not quite the native choice: You cannot smoke until/before you are 20 years old.
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3 Answers
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Jasminn. I don't know these sentences are OK or not.
'Must' is wrong: it suggests an internal compulsion. Your other structure is OK, but not quite the native choice:

You cannot smoke until/before you are 20 years old.
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Thank you, Mister Micawber
So you mean these are grammatical but natives don't say like this?

You cannot smoke until 20 years old.
You cannot smoke under 20 years old.

I'm wondering it's possible to use "under" in this position?
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JasminnSo you mean these are grammatical but natives don't say like this?
They don't commonly say so; otherwise, they are OK.
JasminnI'm wondering it's possible to use "under" in this position?
Yes. Attractions commonly state "Children under 6 must be accompanied by adults'. Note that 'must' here (and it is the affirmative

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