Unit 7 Teenagers should be allow ed to choose their ow n clothes Section A 1. 语态： 1) 英语有两种语态：主动语态和被动语态 主动语态表示主语是动作的执行者，被动语态表示主语是动作的承受者。 Cats eat fish. （主动语态）猫吃鱼。 Fish is eaten by cats. (被动语态)鱼被猫吃。 2）被动语态的构成 由“助动词be ＋及物动词的过去分词” 构成。（如果要强调动作的执行者，可加上by+执行者。 助动词be 有人称、数和时态的变化，其变化规则与be 作为连系动词时完全一样。 时态 被动语态结构 例句 一般现在时 am/is/are done English is spoken by many people. 许多人说英语。 一般过去时 was/were done Rome wasn’t built in a day. 罗马不是一天建成的 一般将来时 shall/will be done am/is/are going to be done A library will be built in the city. 市里将建一个图书馆 The plan is going to be discussed at the meeting tomorrow. 该计划将会在明天的会议上讨论。 过去将来时 should/would be done was/were going to be done He told me that he would be taught a lesson by his father. 他告诉我他会被他的爸爸教训一顿。 He told me the plan was going to be discussed at the meeting 他告诉我该计划将会在会议上讨论 现在进行时 am/is/are being done The car is being repaired. 车正在被修理。 过去进行时 was/were being done The car was being repaired at this time yesterday. 昨天的这个时候车正在被修理。 现在完成时 have/has been done This novel has been translated into many languages. 这部小说已被译成多种语言。 过去完成时 had been done When he reached the station, all the tickets had been sold out. 当他到车站时票已售完 注：done 即及物动词的过去分词。 3）含有情态动词的被动语态由“情态动词+be+及物动词的过去分词”构成。如： The trees may be planted in spring. 树可在春天种植。 The room must be kept clean. 房间必须保持整洁。 Teenagers should be allowed to choose their own clothes.青少年应当被允许选择他们自己的衣服。 4）被动语态的用法 当我们...
