A monkey has learned to turn on the lights,play a recorder w

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A monkey has learned to turn on the lights,play a recorder when she is told to.最后为什么要加to
A monkey has learned to turn on the lights,play a recorder when she is told to.末尾的to可以省略掉吗?tell是及物动词为啥要加上to呢?
原句为A three-year-old monkey named Helen has learned to 15 on and off the light,use a recorder and open doors and windows when he is told to.

这是一个省略的说法,应该是be told to do sth.被告知做某事.
再问：首先谢谢你的慷慨解答！但是省略的部分是什么呢？
再答： learn.... 其实就是前面提到的。

A monkey has learned to turn on the lights,play a recorder w The girl has learned to play the piano,but she can play a co Turn on the lights Turn on the lights. Oh,it's dark!_____ the lights,please!A.Open B.Turn on C.Turn Please ( ) the lights .Dad is sleeping A turn on B get on C You should ____ the lights when you leave the room.A.turn on You want Tim to turn on the lights for you It's ____ in his classroom.please turn on the lights.(A.blac Don't forget to turn off the lights when leaving a room.这句话对 I'm leaving now ,_______ you turn off the lights A.To make s I`m leaving now.( )you turn off the lights.A To make sure B