英语求教啊!毕竟我是个英语废He must be working.（改否定猜测）Sally goes to school,she _____（can‘t be,must be）at home now.还有几十分钟就要去上课了快!
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英语求教啊!毕竟我是个英语废Hemustbeworking.（改否定猜测）Sallygoestoschool,she_____（can‘tbe,mustbe）athomenow.还有几十分钟就要去上课
英语求教啊!毕竟我是个英语废He must be working.（改否定猜测）Sally goes to school,she _____（can‘t be,must be）at home now.还有几十分钟就要去上课了快!
英语求教啊!毕竟我是个英语废
He must be working.（改否定猜测）
Sally goes to school,she _____（can‘t be,must be）at home now.
还有几十分钟就要去上课了快!
英语求教啊!毕竟我是个英语废He must be working.（改否定猜测）Sally goes to school,she _____（can‘t be,must be）at home now.还有几十分钟就要去上课了快!
He mustn't be working.（改否定猜测）
Sally goes to school,she __can't_be__（can‘t be,must be）at home now.
He can't be working.
can't be.
He can't be working. 否定推测用can't 肯定推测用must be. 填can't 理由和第一题一样 祝愉快！
He can't be working.
can't be
很肯定地推测在做什么用must do sth.
很肯定地推测不在做什么用can't do sth