The book's explanation is not an accurate picture of how people use these words. Abd the writers have got the answers wrong by their own rules! It is not possible to give a simple explanation of must and have to ; we don't all use them in the same way.
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fivejedjon the writers have got the answers wrong by their own rules!That's what I felt.
nsfs2A school book explaining the difference between 'must' and 'have to' ...If you're interested in American usage, see the thread at Must & have to