Unit 7 Teenagers should be allowed to choose their own clothes. ?单元语法总结及练习（含解析）人教版九年级全册

九年级英语 Unit 7 Teenagers should be allowed to choose their own clothes.
单元语法
含情态动词的被动语态
本单元重点语法为情态动词的被动语态，结构为：
情态动词（should, can, may, must 等） + be + 过去分词
用于表达“某事应该/可以/必须被做”的含义。
例句：
Teenagers should be allowed to choose their own clothes.（青少年应该被允许选择自己的衣服。）
Phones must not be used in class.（课堂上禁止使用手机。）
否定形式： 情态动词后加 not，即：情态动词 + not + be + 过去分词
Students shouldn’t be punished for small mistakes.（学生不应该因为小错误被惩罚。）
疑问句形式： 将情态动词提前至句首，即：情态动词 + 主语 + be + 过去分词 + 其他？
Should teenagers be allowed to stay out late （青少年应该被允许在外待到很晚吗？）
二）动词不定式作宾语补足语
在描述青少年的行为、教育等方面，动词不定式作宾语补足语的用法十分常见，用于补充说明宾语的行为、状态或意图。
常见接动词不定式作宾语补足语的动词：在本单元中，有许多动词常接动词不定式作宾语补足语，如 allow（允许）、ask（要求）、tell（告诉）、want（想要）、teach（教）等。例如，“Parents allow their children to make their own decisions.（父母允许他们的孩子自己做决定）”，“their children” 是宾语，“to make their own decisions” 是宾语补足语，补充说明父母允许孩子进行的行为。再如，“The teacher asks us to finish our homework on time.（老师要求我们按时完成作业）”，“us” 是宾语，“to finish our homework on time” 对宾语 “us” 进行补充，表明老师对 “我们” 的要求。
动词不定式作宾语补足语的语义功能：动词不定式作宾语补足语能够清晰地表达出主语对宾语的期望、要求或使宾语去执行某种动作的意图。以 “teach” 为例，“The coach teaches the players to play basketball better.（教练教运动员们把篮球打得更好）”，“to play basketball better” 这个宾语补足语明确了教练教导运动员的具体内容和目标，即提升打篮球的水平。在描述青少年成长过程中他人对他们的引导、教育等场景时，这种结构能够准确传达信息。
不带 to 的动词不定式作宾语补足语的特殊情况：在一些使役动词（如 let、make、have）和感官动词（如 see、hear、watch、feel 等）后，动词不定式作宾语补足语时通常省略 to。例如，“Let me help you.（让我帮助你）”，“help” 前省略了 to；“I saw him play football on the playground.（我看见他在操场上踢足球）”，“play football” 前也省略了 to。但当这些句子变为被动语态时，省略的 to 要还原。例如，“He was seen to play football on the playground.（有人看见他在操场上踢足球）”，这里在被动语态中，“to play football” 中的 to 必须加上。
（三）if 引导的条件状语从句（真实条件句）与情态动词的结合运用
在探讨青少年的行为准则、权利义务等话题时，常使用 if 引导的条件状语从句（真实条件句）与情态动词结合，来表达在某种条件下可能或应该发生的情况。
if 引导的条件状语从句的基本结构和用法：if 引导的条件状语从句结构为 “if + 从句（一般现在时），主句（一般将来时 / 含情态动词的句子）”。例如，“If you study hard, you will pass the exam.（如果你努力学习，你就会通过考试）”，“If you study hard” 是条件状语从句，用一般现在时表示假设的条件；“you will pass the exam” 是主句，用一般将来时表示在满足条件的情况下可能产生的结果。在本单元情境中，如 “If teenagers are responsible enough, they should be allowed to make their own choices.（如果青少年足够有责任感，他们应该被允许自己做选择）”，通过这种结构，明确了青少年被允许自主做选择的前提条件是具备足够的责任感。
与情态动词结合的语义表达：当主句中使用情态动词时，能更灵活地表达不同的语气和态度。例如，“If you finish your homework early, you can watch TV for a while.（如果你早点完成作业，你可以看一会儿电视）”，“can” 在这里表示一种许可，即在完成作业早这个条件下，获得看电视的许可。再如，“If it rains tomorrow, we may have to cancel the picnic.（如果明天下雨，我们可能不得不取消野餐）”，“may have to” 表达了在下雨这个条件下，取消野餐的可能性和必要性。这种结合方式在日常生活和交流中，用于根据不同条件做出相应的决策或判断。
注意事项：在使用 if 引导的条件状语从句与情态动词结合的结构时，要注意时态的正确运用。条件状语从句通常用一般现在时表示将来可能发生的情况，主句根据具体语义选择合适的时态或情态动词。同时，要确保句子逻辑清晰，条件和结果之间的关系合理。例如，不能说 “If I will go to the park tomorrow, I can meet my friends.（错误）”，而应该是 “If I go to the park tomorrow, I can meet my friends.（正确）” 。
二、学以致用
（一）语法填空
Students should ______ (allow) to have more free time to develop their hobbies.
The teacher asked the students ______ (clean) the classroom after school.
If it ______ (not rain) tomorrow, we will go for a picnic.
My brother is ______ (tall) than me.
The book must ______ (return) to the library on time.
Let's ______ (go) to the movies tonight.
She is the ______ (good) singer in our school.
If you want to be healthier, you should eat ______ (little) junk food.
Teenagers shouldn't be allowed ______ (drive) a car.
I heard him ______ (sing) in the next room just now.
（二）阅读理解
In many families, teenagers are not allowed to make their own decisions. Parents always think they know what's best for their children. But is that really true
A recent study shows that teenagers who are allowed to make some decisions on their own are more likely to be independent in the future. For example, when choosing clothes, if teenagers can choose what they like, they will feel more confident. And this confidence can help them in other aspects of their lives.
However, it doesn't mean that teenagers should be allowed to do everything. There should be some rules. For example, they should be allowed to choose their own clothes, but they still need to follow the school dress code. Also, when it comes to important decisions like choosing a career, parents and teenagers should communicate and make the decision together.
What do many parents think
A. Teenagers should make their own decisions.
B. They know what's best for their children.
C. Teenagers are always right.
What can help teenagers be more confident according to the passage
A. Making decisions on their own when choosing clothes.
B. Always following their parents' advice.
C. Wearing expensive clothes.
What does the underlined word "aspects" mean in Chinese
A. 方面
B. 外貌
C. 角度
Which of the following is TRUE according to the passage
A. Teenagers should be allowed to do everything.
B. Teenagers don't need to follow any rules.
C. When choosing a career, parents and teenagers should make the decision together.
What's the main idea of the passage
A. Parents should always make decisions for their children.
B. Teenagers should be allowed to make all their own decisions.
C. Teenagers should be allowed to make some decisions on their own with certain rules.
（三）翻译句子
青少年应该被允许选择他们自己的课外活动。
老师告诉我们要按时交作业。
如果明天天气好，我们可以去爬山。
他比他的哥哥更擅长运动。
她是我们班最聪明的学生之一。
（四）写作任务
以 “Should Teenagers Be Allowed to Make Their Own Decisions ” 为题，写一篇短文，表达你的观点。内容包括：你是否认为青少年应该被允许自己做决定，理由是什么（至少两条），可以适当举例说明。要求运用本单元所学语法知识，不少于 80 词。
答案
（一）语法填空
be allowed。should 是情态动词，后接动词原形，此处是含情态动词的被动语态，用 be allowed。
to clean。ask sb. to do sth. 表示 “要求某人做某事”，用 to clean。
doesn't rain。if 引导的条件状语从句，主句用一般将来时，从句用一般现在时，it 是第三人称单数，否定用 doesn't rain。
taller。than 是比较级的标志，tall 的比较级是 taller。
be returned。must 是情态动词，后接动词原形，此处是含情态动词的被动语态，用 be returned。
go。let's 后接动词原形，用 go。
best。in our school 是比较范围，用最高级，good 的最高级是 best。
less。根据 “to be healthier” 可知要少吃垃圾食品，little 的比较级是 less。
to drive。be allowed to do sth. 表示 “被允许做某事”，用 to drive。
sing。hear sb. do sth. 表示 “听见某人做某事的全过程”，用 sing。
（二）阅读理解
B。根据 “Parents always think they know what's best for their children.” 可知选 B。
A。从 “when choosing clothes, if teenagers can choose what they like, they will feel more confident.” 可知选 A。
A。“aspects” 在这里表示 “方面”，选 A。
C。根据 “when it comes to important decisions like choosing a career, parents and teenagers should communicate and make the decision together.” 可知 C 正确；A 与 “it doesn't mean that teenagers should be allowed to do everything” 不符；B 与 “There should be some rules” 不符。
C。文章主要讲述青少年应该在一定规则下被允许自己做一些决定，选 C。
（三）翻译句子
Teenagers should be allowed to choose their own after - school activities.
The teacher told us to hand in our homework on time.
If it is fine tomorrow, we can go climbing.
He is better at sports than his elder brother.
She is one of the cleverest students in our class.
（四）写作任务
Should Teenagers Be Allowed to Make Their Own Decisions
In my opinion, teenagers should be allowed to make their own decisions.
Firstly, making their own decisions can help teenagers develop independence. For example, when choosing after - school activities, if they are allowed to decide according to their own interests, they will learn to take responsibility for their choices. They can plan their time and efforts by themselves, which is an important step towards adulthood.
Secondly, it can boost teenagers' confidence. When they are allowed to make a decision and succeed, they will feel a great sense of achievement. For instance, if a teenager is allowed to choose the clothes he or she likes, and gets praised for the good taste, he or she will be more confident in expressing opinions in other aspects.
However, it doesn't mean teenagers can do whatever they want. There should be proper guidance from parents and teachers. When it comes to important decisions like choosing a high school or a future career, they should communicate with adults and make decisions together. In conclusion, with certain rules and guidance, teenagers should be given the right to make some of their own decisions.