The word mustn't is a contraction, a shortened form for must not.
The word 'must' is an auxiliary verb and the word 'not' is an adverb used to modify the verb.
Examples:
You must not disturb grandma while she's napping.
You mustn't disturb grandma while she's napping.
My mother always said "you mustn't go swimmingafter a meal".
I mustn't forget to pick up my trousers from the dry cleaners.
You mustn't drive if you have been drinking.
You can use "mustn't" to indicate something that is prohibited or not allowed. For example, "You mustn't smoke in this area" means that smoking is not permitted.
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it depends on how the sentence goes. for example, if it is a shocking news, you use the exclamatory sentence.
The contraction mustn't means "must not."
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So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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You can use a period to create a clear and concise separation between independent clauses or to end a sentence. This can help to prevent run-on sentences and make the meaning of each sentence clearer for the reader.