1、八年级英语上册Unit 2 语法知识讲解和练习一、知识讲解【情态动词could/can 的用法】1.can 的用法(1) 表示能力（ability）指现在或一般的能力，意为“能，会”。 例句： She can speak French fluently.她能流利说法语。 Can you swim?你会游泳吗？ (2) 表示请求或允许（permission）用于口语中请求许可，比 “could” 更直接。 例句： Can I borrow your pen?我能借你的笔吗？You can go now.你现在可以走了。 (3) 表示可能性（possibility） 指理论或逻辑上的可能性。 例句
2、： Smoking can cause cancer.吸烟可能导致癌症。2.could 的用法(1) 表示过去的能力（past ability）指过去具备的能力，但现在已经不适用。 例： When I was young, I could run very fast.我小时候跑得很快。 (2) 表示委婉请求（polite request）比 can 更礼貌，用于正式或不确定的场合。 例句： Could you help me with this problem？你能帮我解决这个问题吗？(3) 表示可能性（possibility, less certain than can)比 can 更不确定
3、，常用于推测或假设。 例句： It could rain tomorrow.明天可能会下雨。 二、知识练习一）用 can/could 填空1._ you open the window? Its too hot in here. 2.When I was five, I _ count to 100. 3._ I use your phone? Mine is out of battery. 4.She _ speak three languages when she was in college. 5.Judy, my bike is broken,_ I use yours?二）选择正确的
4、选项1._ you pass me the salt, please? A.Can B.Could C.Both A and B 2.He _ play the piano when he was six. A.can B.could C.cant 三）改错题1.Can you helped me with my homework? 2.She can read when she was four. 3.Could I have some water? No, you couldnt. 四）翻译句子1.你能告诉我怎么去火车站吗？ 2.他小时候会弹吉他。 3.如果我有时间，我就能参加你的派对。
5、五）根据培境用can,could,cant或couldnt将下面的短文补充完整。On Saturday afternoon, Mum was busy in the kitchen.Mum,what will you do after doing thedishes? 1._ Frankie and I play with you?”John said.Sorry,I 2._ play with you.Today I have lots of housework to do,Mum said.“Mum,we3._ help you,Johnsaid. “0K.4._ you please w
6、ater the flowers first?Mum asked.“Sure,”John said.“Whats next,Mum?”John asked,“ 5._ you please take Frankie outside to play?Mum asked.John thought they 6._ play in the park,so he said yes.Afer they arrived at the park,Frankie asked,“ 7._ I play on the seesaw(跷跷板)？“Yes,”John said.After playing for a
7、while,John saw rrubbish everywhere in the park, and he 8._ stand (忍受)it.So he said to Frankie,“9._ you help me pick up the rubbish?No problem.Lets work together to make the park clean and tidy,Frankie said.“Im proud(自豪的)of you,John and Frankie,”Mum said after knowing what happened in the park.六)选择正确
8、的词语并用其正确形式填空，使短文通顺、意义完整。每词使用一次。show better chores sweep feed have memorable helpcut makeWhen I was a child, I lived in a small house with my parents.Every day after school, I would help my mother do some 1._ .She always asked me 2._ the floor or clean the table.Sometimes, I 3._ the fish. One day, my
9、 mother said to me, Could you please 4._ me make dinner? I was very happy to do that.I washed the vegetables and 5._ them into small pieces.Then my mother showed me how to cook.It was a great experience.On weekends, my father would often take me to the park near our house.We would play games and 6._
10、 a good time.Those days were really 7._ .As I grew older, I realized that doing things for my home was not only a duty but also a way 8._ my love for my family.Now, whenever I have time, I still do some housework.I know that these small things can make our home a 9._ place.Last week, my parents were
11、 away on business.I took good care of the house.I cleaned every room and 10._ the bed.When they came back, they were very happy and proud of me.1._ 2._ 3._ 4._ 5._ 6._ 7._ 8._ 9._ 10._ 【答案】一)、 1.Can / Could 2.could 3.Can / Could 4.could 5.can/could二)、1.C（Can / Could 均可，但 Could 更礼貌） 2.B（过去能力） 三)、1.Ca
12、n you helped me with my homework? help（情态动词后接动词原形） 2.She can read when she was four. could（过去能力） 3.Could I have some water? No, you couldnt. cant（否定回答用 cant） 四)、 1.你能告诉我怎么去火车站吗？ Could you tell me how to get to the train station? 2.他小时候会弹吉他。 He could play the guitar when he was young. 3.如果我有时间，我就能参加你的派对。 If I had time, I could join your party. 五）1.can/could 2.cant 3.can 4.can/could 5.can/could6.could 7.can/could 8.couldnt 9.can/could六)、 1.chores 2.to sweep 3.fed 4.help 5.cut 6.have 7.memorable 8.to show 9.better 10.made3
