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Hi! everyone. I have a problem using "must" in a sentence.
Q-1 (Situation)-If a professor asks students in the class.(and also tell me,is it right to say this sentence?)"You must not have a ruler"(because we are in 12th grade.we are not supposed to have a ruler because we don't use it as we are not 2nd or 3rd grade students So professor is using "must" as a strong probability that it is less likely that anyone in the class has a ruler but still he thinks what is bad in it if he asks us, maybe anyone has.

Q-2 Can I use "must" like in this sentence as question-Must anyone in the class has a ruler ? or I should use "might"
Might anyone in the class has a ruler ? (Actually professor is not really asking these "must" and "might" questions he is just thinking in his mind before asking the sentence in the above question no 1)
I will be very thankful,if you answer?
Thanks!
Comments  
The sentence "You must not have a ruler" is awkward and unclear.
If you wanted to suggest that rulers are forbidden, I would say:
"You may not use a ruler in this class."
Or, to say it more gently: "We do not use rulers in this class."

The original sentence indicates that the person lacks a ruler.
"You must not have a ruler" (if you draw lines so crookedly.)

For the second sentence, I would say
"Does anyone have a ruler?"
"Has anyone used a ruler?"
(By the way, say "does anyone have" not "has")
The professor can wonder "Might anyone have a ruler?" (Meaning: "Does anyone possess a ruler." ) But this does not indicate that they are forbidden or accepted.

The positive form is clearer:
"You must have a ruler." ("You are required to have a ruler") (In a special case, this could mean "You can only do that if you use a ruler.")
"You might have a ruler." (It is possible that you own one.)
"You may have a ruler." (You have permission to use one.)

Does this help?
Thanks! Doctor D. Could you tell me,do we use "must" as interrogative?
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You can:
"Must you always cause trouble?" (Meaning: "Don't do that.")
CJsilak12I have a problem using "must" in a sentence.
I can see that. You are putting it sentences where it doesn't belong. You don't need "must" to express any of the ideas you are trying to express in those two sentences. Emotion: smile

Q-1. These are possible, depending on what you mean:

You should not have a ruler.
You are not allowed to have a ruler.
You are not supposed to have a ruler.
Why do you have a ruler?
What are you doing with a ruler?

Q-2. These are possible, depending on what you mean:

Does anyone in this class have a ruler?
I wonder if anyone in this class has a ruler.
Who has a ruler in this class?
I wonder who has a ruler in this class.

CJ
CalifJimQ-2. These are possible, depending on what you mean:
Does anyone in this class have a ruler?
I wonder if anyone in this class has a ruler.
Who has a ruler in this class?
I wonder who has a ruler in this class
Thanks! Calif. I am really very grateful.
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silak12Thanks! Calif. I am really very grateful.
I'm glad to hear it!

CJ