make复合结构中,不定式作宾补,必须省略to,所以出现make sb do sth；被动中,主补时,必须加上to.所以sb be made to do 例如：
His father makes him study at least 12 hours a day. 不能说to study,to须省略.
被动：He is made to study at least 12 hours a day (by his father). to不能省,必须加出来.
这是固定用法
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