特殊用法

如see, hear, feel, watch, make, let, help在主動(dòng)語(yǔ)態(tài)中常接不帶 to的動(dòng)詞不定式，變?yōu)楸粍?dòng)后則要加上to

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

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