The wallet had been wrapped up in newspaper and it contained half the money he had lost.
钱包是用报纸包着的，里面有他丢失的钱的一半。（过去完成时中的被动语态）Passive voice, and its attendant obscurity, turn out to be very useful.
被动语态，以及伴随而至的语焉不详，结果是非常有用的。the voice is a form of the verbs, which means the sentences with the subject of the relationship between the predicate verbs.
语态是动词的一种形式，它用来表示句中主语同谓语动词之间的关系。For each pair of sentences , decide where to use the active or passive form of the verb .
在以下每组句子里，判断是该用单词的主动语态还是被动语态。As one of language means to express ideas objectively, English passive voice is often seen in English news reports and scientific articles.
作为文字表达客观化的手段之一，英语被动语态常见于英语新闻报道和科技文章中。Change the form of the phrases in italics. Do not refer to the passage until you finish the exercise.
将斜体印出的部分改写成被动语态，完成练习后再对照课文核对你的答案。Indicating that the subject of the sentence is performing or causing the action expressed by the verb. Used of a verb form or voice.
主动的，主动语态的：表示句子主语完成或导致动词表达的动作的。用于动词形态或语态。Grammar Of a verb form or voice in which the subject both performs and is affected by the action specified.
和动词形式或动词语态有关的，这个动词的主语既是行为主体，又受行为所影响。As each of the two passive voices has its character, the preposition, which collocates with it, is quite different.
由于两种被动语态的性质特征不同，与之搭配的介词也就不尽相同。