must(表猜测)造句越多越好

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Nancy must have read this book.
======以下答案可供参考======
供参考答案1:
it must be his. the book can be our teacher
供参考答案2:
He must be the teacher who will teach us.
供参考答案3:
Wanglei must be in the classroom now because I saw him just now there.