You must read the book, as must your brother.
I want to use this sentence to express the following meaning:
- Your brother must read the book;
- You also must read the book like your brother.
Is it natural?
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To my English ear
"You must read this book, as must your brother"
might easily and naturally be spoken by a parent forcefully emphasising to each sibling individually and without ambiguity that neither of them has a choice...
(Looking at one child) "You must read this book,..." (turning to look at the brother) "...as must your brother!"