七年级英语下册Unit3 语法和写作一、语法一、物主代词物主代词表示所有关系的代词，是人称代词的属格形式一）分类分为形容词性物主代词和名词性物主代词形容词性物主代词：my我的；your你的；his他的; her她的; its它的; our我们的; your你们的; their他们的名词性物主代词：mine我的; yours你的; his 他的; hers 她的; its它的; ours 我们的; yours 你们的; theirs 他们的（二）用法：形容词性物主代词具有形容词的特性，在句中作定语，后面接名词名词性物主代词具有名词的特性，后面不可再接名词，在句中作主语、表语或宾语Eg: (1) This is my book.= This book is mine. 这是我的书2)--Is this pencil yours or hers ? -- It’s mine.Hers (= her pencil) is in her bag.-- 这支铅笔是你的还是她的？ -- 是我的她的在她的包里 名词性物主代词主语时，谓语动词的数随所指代的人或物的数而定Eg: -- Whose books are these ?-- They are his.Yours are over there.二、名词所有格* 名词的主格和宾格形式上没有区别。
但所有格多作定语(有时作表语），表示人和物的隶属关系Eg: 所有格作定语：Tony's mother is a doctor. 托尼的妈妈是一名医生所有格作表语： This house is Tony's. 这所房子是托尼的 所有格形式的分类（一）用来表示有生命的所有格1.一般情况为：名词 + ‘s如： Betty's pen 贝蒂的笔2.若某单词是以s结尾，则只需在词尾加 ' 即可如： Hans' book 汉斯的书the students' desks 学生的桌子3.表示几个人共同拥有时，在最后一个名词后加‘s如: Lily and Lucy's room 丽丽和露西共同的房间4.表示每个人各自拥有时，在每个名词后加's如： Mike's and Tony's desks 麦克和约翰各自的书桌5.表示时间、距离、国家等的名词，单数加's ; 复数加'如：five minutes' walk 步行五分钟的路程 China's development 中国的发展注意：1）表示“家”、“店铺”、“办公室”等处所时，由“名词 + ’s”所有格所修饰的名词house、shop、office常被省略Eg: at my mother's (home) 在我妈妈家at the doctor's (office) 在医生的诊所2）基数词 + 连字符 + 可数名词单数，一般作定语修饰名词，它相当于“基数词 + 名词所有格”Eg: a two-day holiday = a two days' holiday 两天的假期3）很多节日的表达都是用的是's所有格形式Eg: Father's Day 父亲节（二）用来表示无生命力的所有格1）“ of + 名词" 的所有格形式主要用于表示无生命力名词的所属关系。
如：a leg of the table 桌子的一条腿2） of所有格有时也可用于人或有生命的东西，表示所属关系，特别是当这些所有者有较长的定语时如： the name of the brave young man 这个勇敢的年轻人的名字3） 表示某物的一部分或抽象概念如： the top of the house 房屋的顶部注意：有的名词所有格可以用两种方法表示如： a photo of my family = my family's photo 我家人的照片（三）双重所有格双重所有格主要表示整体中的一部分（被修饰名词前通常有表示数量的词a, two, many等）或感情色彩（被修饰名词前通常有指示代词this, that, these, those等)双重所有格一般有两种形式1）of + 名词所有格如：a teacher of my sister's 我姐姐的一位老师2）of + 名词性物主代词如： a new friend of mine 我的一个新朋友注意：双重所有格和of所有格意义不同 如：a picture of his brother's 他弟弟的一张照片（强调是他弟弟众多照片中的一张，照片上不一定是他弟弟本人）a picture of his brother 他弟弟本人的一张照片（强调照片上是他弟弟本人）【即学即用】一、用所给词的适当形式填空1.-- Is this English book _yours_ (your)? -- No, it isn’t.2.This green bag isn’t Lucy’s._Hers_ (her) is blue.3.--Is this your book? -- No, __mine__ (my) is in my bag.4.Are these books __theirs__ (they)?5.Your hair is long, __mine__ (my) is short.二、单项选择( C )1.This isn’t ______ book._______ is _______ book.A.hers; Its; his B.his; It; she C.her; It; his D.his; It’s; hers( A )2.-- Is the purple pen ______?-- No, it’s ______.A.hers; his B.her; mine C.hers; my D.her; his( B )3.-- Is this ______ mobile phone?-- No, it isn’t ______.It belongs to Lily.A.yours; mine B.your; mine C.your; my D.yours; my( A )4.____ schoolbag is new.But _____ is old.A.My; Jim’s B.Mine; Jim’s C.Me; Jim’s D.I; Jims’( D )5.-- Can I use ______ camera?-- Sorry._____ isn’t here.A.you; I B.your; My C.yours; Mine D.your; Mine( B )6.-- Lucy, is this _____ pet dog?-- No.______ is white.A.you; My B.your; Mine C.your; My D.yours; Mine三、用正确的代词完成短文There are three people in 1._my_ family -- my father, my mother and I.My father is a bus driver and he likes 2._her_ job.My mother is a doctor.3._She_ works in a big hospital.Oh, the red car is 4._hers_.She often drives 5._it_ to work.I’m a student in Class One, Grade Seven.I like English very much and I do well in it.My English teacher likes 6._me_.And 7._We_ are good friends.My parents are very busy every day.8._They_ don’t have much time to play with me.So I often play with my cat.9._Its_ name is Xiaolou.It is very lovely(可爱的) and I like 10._it_ a lot.二、写作本单元写作话题为“最喜欢的保持健康的方法”。
一）常见短语：1.Eat more fruit and vegetables 多吃果蔬2.Do more exercise 多做运动3.Drink enough water 喝足够的水4.Have a good sleep 睡个好觉 5.Keep fit 保持健康（二）常见句式：1.Healthy is very important to everybody.2.Here are some useful tips.3.If we pay more attention to the tips above, we will have healthier body.4.I wish everybody has a strong and healthy body.（三）写作方法：可按照“总分总”结构总：直接引出话题，交代健康的重要分：分别如何保持健康总： 每个人都需要健康的身体四）范文：As we all know, healthy is very important to everyone.But do you really know how to stay healthy? Here are some useful tips.First, we should do exercise if we have example, we can go to swim in the summer holiday.Or we can take a walk after exercise makes us healthy and strong.Second, we should take more vegetables and fruit and less candies.Last but not least, we should go to bed early and wake up early.We should have enough sleep, or we will get sleepy in the day time.If we pay more attention to the tips above, we will have healthier body.I wish everybody has a strong and healthy body.3。