Is this correct to say?
I must read this book twice

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Yes, if you are trying to say that you must read the same book two times, then your sentence is perfect.

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The sentence is correct according to grammar rules but it also depends on what exactly did you want to express.

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The words are perfect. The only improvement that I would suggest is to put a period ( . ) at the end of your sentence.

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Yes, that is fine.  Just put a period (.) at the end of your sentence, unless you use a question mark (?).

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Hi Tatiana, "to" never follows "must".  However, in your question "be" must follow "will". These are the rules for modal verbs. :)

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