新目标英语九年级三单元U3-3 语法知识点含3情态动词的被动语态.pptVIP

Unit 3-3 Teenagers should be allowed to choose their own clothes. 吕文佳 cherry 重点单词短语拓展 基本词汇辨析 被动语态与倒装句 1.语态： 英语有两种语态：主动语态和被动语态.　 　主动语态表示是动作的执行者。 　被动语态表示主语是动作的承受者。　 　 Cats 　eat 　fish. （主动语态）猫把吃鱼了。  　 Fish is eaten by cats.(被动语态)鱼被猫吃。 被动语态的构成: 　 “助动词be ＋及物动词的过去分词” 2. 被动语态的时态、人称和数的变化 主要体现在be的变化上，其形式与系动词be的变化形式完全一样。 一般现在时： am/is/are+done 一般过去时： was/were+done 一般将来时： shall/will+be done 一般过去将来时：should/would+be done 现在进行时： am/is/are+being+done 过去进行时： was/were+being+done 现在完成时： have/has+been+done 过去完成时： had+been+done ［注］被动语态没有将来进行时和过去将来进行时。 3.初中常见5种时态用法 1）一般现在时： am/is/are+done (1)People grow rice in the south of the country. Rice is grown in the south of the country. (2)The school doesnt allow us to enter the chemistry lab without a teacher. We are not allowed to enter the chemistry lab without a teacher. 2) 一般过去时: was/were+done (1)They agreed on the building of a new car factory last month. The building of a new car factory was agreed on last month. (2)The students didnt forget his lessons easily. His lessons were not easily forgotten. 3). 一般将来时： shall/will+be done (1)They will send cars abroad by sea. Cars will be sent abroad by sea. (2)They will give plenty of jobs to school-leavers. Plenty of jobs will be given to them. 4). 现在完成时： have/has+been+done (1)Someone has told me the sports meeting might be put off. I have been told the sports meeting might be put off. (2)He has brought his book here. His book has been brought here. 5).含有情态动词的被动语态： “情态动词+ be+ 及物动词的过去分词”构成。 (1)You must hand in your compositions after class. Your compositions must be handed in after class. (2)He can write many letters with the computer. Many letters can be written with the computer by him. 语态转换时所注意的问题: 把主动语态变为被动语态时，其谓语动词的时态要与原句时态保 持一致，其谓语动词的数要与新主语保持一致。 We have bought a new computer