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特殊用法

如see, hear, feel, watch, make, let, help在主动语态中常接不带 to的动词不定式，变为被动后则要加上to

有些动词，，如：make sb. do sth. →被动：be made to do sth.see sb. do sth. →被动：be seen to do sth.help sb. (to) do sth. →被动：be helped to do sth.The boss made him work 14 hours a day. That means, hewas made towork14 hours a day.