▲在下列情况下要用被动语态
（1） 当句子的主语是这个不定式所表示动作的承受者。
Eg: She is glad to be taken to the Great Wall.
This book is said to be put into English.
(2) 当不定式所修饰的名词是此不定式的逻辑宾语且句中又没有它的逻辑主语时。
Eg: He wanted the letter to be typed at once.
(3) 当句子的主语是不定式的逻辑宾语时，且不定式本身又带有一个宾语时，
Eg: She is too nervous to be told such a bad news.
I’m glad to be given a gold ring.
