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半助动词 be bound to

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半助动词 be bound to
He must be in the office.=He is bound to be in the office .为什么?能用be sure to
半助动词 be bound to
e bound to 表示注定要、计划好的意思
must 表示一定要、迫于压力的原因
两者意思差不多.
be sure to = be bound to 一定要... 所以可以替换.
半助动词 be bound to be bound to it's bound to be 用be bound to 造句 be bound to=什么 sb be bound to do sth是什么意思 be bound to和must的区别? be duty bound to 是不是存在语法错误? It is bound to be confusing be bound to do 还是doing 半助动词 be certain to be sure to 的区别 be destined to和be bound to有什么区别