Won't
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The contraction "mustn't" means "must not." Must is an auxiliary verb and not is an adverb.
A short form of two words is a contraction generally written with an apostrophe. "I am" becomes "I'm", "they are" becomes "they're", "where is" becomes "where's"
In written form you would say it as one billion
'Alright' is a one word contraction of the phrase 'all right', and it is correct for either form to be used in a sentence.
No. A contraction cannot be a compound word.