Unit 7 Teenagers should be allowed to choose their
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Unit 7
Teenagers should be allowed to choose their
own clothes.
Talk with your classmates about your school rules by using “students are not allowed to…”.
一般现在时的被动语态
在英语中，动词有两种语态，即主动语态 和被动语态。被动语态的基本结构是“助 动词 be + 及物动词的过去分词”，其中助 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 完全一样。
1.一般现在时被动语态的各种句式结构
肯定式 主语+am/is/are+过去分词（ + by…) 否定式 主语+am/is/are + not +过去分词 (+by…)
含情态动词should的被动语态
1.含情态动词should的被动语态结构式： should + be+及物动词的过去分词。
(1)肯定句结构为：主语+should be+及物动词 的过去分词+ (by+宾语)。
eg: 你应该自己完成作业。 Your homework should be finished by yourself.
I agree. They aren’t serious enough. No, I don’t agree with this. Teenagers are too
young to make their own decisions. I disagree. They can learn a lot from working. If you don’t use a flash, then it may be OK.
(2)否定结构为：主语+ should + not+ be +及 物动词的过去分词+ (by+宾语)。
eg：Байду номын сангаас应该允许青少年晚上外出。
Focus
I don’t think sixteen-year-olds should be allowed to drive. Do you think teenagers should be encouraged to make their own decisions?
Teenagers should not be allowed to have part-time jobs. Do you think we may be allowed to take some photos if we don’t use a flash?
School rules
Don’t arrive late for school.
= Students are not allowed to arrive late for school.
School rules
Don’t run in the hallways.
= Students are not allowed to run in the hallways.
Don’t wear long hair. (boys)
= Boys are not allowed to wear long hair.
School rules
Don’t sleep in class.
= Students are not allowed to sleep in class.
Grammar
School rules
Don’t eat in the classroom.
= Students are not allowed to eat in the classroom.
School rules
Don’t listen to music in the classroom.
= Students are not allowed to listen to music in the classroom.
You aren’t allowed to take photos.
3.主动语态变为被动语态的方法
第一步:将主动语态的宾语改为被动语态的主语； 第二步:将主动语态的谓语改为“be+及物动词的过 去
分词”结构； 第三步:将主动语态的主语改为介词by的宾语，放在
谓语之后(有时可省略)。 主如动图语态示: ：They (主语）grow (谓语）tea (宾语）in the south-east of China.
被动语态: Tea (主语）is grown (谓语）by them in the south-east of China.
Grammar
含情态动词的被动语态
can, could (能；会), may; might (可以) must(必须), should(应该), will; would(愿意) have to(必须；不得不), had better(最好)
Am/Is/Are+主语+过去分词(+ by …)? 疑问式
特殊疑问词+ am/is/are+主语+过去分词（+ by ...)?
被动不离“be” “p.p.”, “p.p.”前面助动be。 主谓一致莫忘记，am, is, are现在时。
2.一般现在时被动语态的基本用法
用法
表示经常性或习惯 性发生的被动动作
表示近期正在发生 的被动动作
描述某种常态化的 被动的客观事实
强调目前存在的针 对行为主体人的被 限制性动作
示例 I am often asked the question by my pupils. These days people are moved by a teacher named Zhang Lili. The spaceship is mainly controlled by computer.
School rules
Don’t fight with others.
= Students are not allowed to fight with others.
School rules
Don’t cheat. = Students are not allowed to cheat.
School rules
Teenagers should be allowed to choose their
own clothes.
Talk with your classmates about your school rules by using “students are not allowed to…”.
一般现在时的被动语态
在英语中，动词有两种语态，即主动语态 和被动语态。被动语态的基本结构是“助 动词 be + 及物动词的过去分词”，其中助 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 完全一样。
1.一般现在时被动语态的各种句式结构
肯定式 主语+am/is/are+过去分词（ + by…) 否定式 主语+am/is/are + not +过去分词 (+by…)
含情态动词should的被动语态
1.含情态动词should的被动语态结构式： should + be+及物动词的过去分词。
(1)肯定句结构为：主语+should be+及物动词 的过去分词+ (by+宾语)。
eg: 你应该自己完成作业。 Your homework should be finished by yourself.
I agree. They aren’t serious enough. No, I don’t agree with this. Teenagers are too
young to make their own decisions. I disagree. They can learn a lot from working. If you don’t use a flash, then it may be OK.
(2)否定结构为：主语+ should + not+ be +及 物动词的过去分词+ (by+宾语)。
eg：Байду номын сангаас应该允许青少年晚上外出。
Focus
I don’t think sixteen-year-olds should be allowed to drive. Do you think teenagers should be encouraged to make their own decisions?
Teenagers should not be allowed to have part-time jobs. Do you think we may be allowed to take some photos if we don’t use a flash?
School rules
Don’t arrive late for school.
= Students are not allowed to arrive late for school.
School rules
Don’t run in the hallways.
= Students are not allowed to run in the hallways.
Don’t wear long hair. (boys)
= Boys are not allowed to wear long hair.
School rules
Don’t sleep in class.
= Students are not allowed to sleep in class.
Grammar
School rules
Don’t eat in the classroom.
= Students are not allowed to eat in the classroom.
School rules
Don’t listen to music in the classroom.
= Students are not allowed to listen to music in the classroom.
You aren’t allowed to take photos.
3.主动语态变为被动语态的方法
第一步:将主动语态的宾语改为被动语态的主语； 第二步:将主动语态的谓语改为“be+及物动词的过 去
分词”结构； 第三步:将主动语态的主语改为介词by的宾语，放在
谓语之后(有时可省略)。 主如动图语态示: ：They (主语）grow (谓语）tea (宾语）in the south-east of China.
被动语态: Tea (主语）is grown (谓语）by them in the south-east of China.
Grammar
含情态动词的被动语态
can, could (能；会), may; might (可以) must(必须), should(应该), will; would(愿意) have to(必须；不得不), had better(最好)
Am/Is/Are+主语+过去分词(+ by …)? 疑问式
特殊疑问词+ am/is/are+主语+过去分词（+ by ...)?
被动不离“be” “p.p.”, “p.p.”前面助动be。 主谓一致莫忘记，am, is, are现在时。
2.一般现在时被动语态的基本用法
用法
表示经常性或习惯 性发生的被动动作
表示近期正在发生 的被动动作
描述某种常态化的 被动的客观事实
强调目前存在的针 对行为主体人的被 限制性动作
示例 I am often asked the question by my pupils. These days people are moved by a teacher named Zhang Lili. The spaceship is mainly controlled by computer.
School rules
Don’t fight with others.
= Students are not allowed to fight with others.
School rules
Don’t cheat. = Students are not allowed to cheat.
School rules