改写下列句子,用MUST BE 来代替括号中的词组

改写下列句子,用MUST BE 来代替括号中的词组
① I (personally ,think he is) a fool.
② I (personally ,think he is} mad.
③ I (personally ,think she is) over forty

he must be a fool.

he must be mad

she must be over forty.
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