1、八年级英语上册Unit 2语法和写作一、语法情态动词can和could用法： can和could为情态动词，没有人称的变化，在句中位于行为动词前，不可单独使用。具体用法如下：（1）表示能力：can表示现在和将来的能力；could表示过去的能力。Eg: I can swim. 我会游泳。Could you speak English then? 那时候你会说英语吗？（2）表可能性：can表示客观可能性；could表示可能性时，语气更加委婉。Eg: That big cinema can seat 2,000 people. 那家大电影院能坐2000人。He could be very frien
2、dly at times. 他有时会很友好。（3）表示请求或许可：can和could都可以用于请求或许可，但could语气更加委婉。Eg: Can I use your car? 我可以借用你的车吗？Could I use your car? 我可以借用你的车吗？（4）表示推测：can在表示推测时，常用于疑问句和否定句中；could表示对过去情况的推测。Eg: This cant be true. 这不可能是真的。He could have finished the task. 他可能已经完成了任务。（5）虚拟语气：could在虚拟条件句中表示对现在或将来情况的虚拟。Eg: If I coul
3、d fly, I would go to the moon. 如果我能飞，我会去月球。【即学即用】( )1.I _ swim very well when I was five years olD.A.can B.could C.cant D.couldnt( )2.My little brother _ ride a bike now.A.can B.could C.cant D.couldnt( )3.She _ speak English fluently last year, but now she can.A.can B.could C.cant D.couldnt( )4.Tom
4、_ play football very well, and he often wins the games.A.can B.could C.cant D.couldnt( )5.When I was younger, I _ run faster than I can now.A.can B.could C.am able to D.will be able to答案：BADAB二、写作本单元写作主题为“写一封邮件邀请朋友帮忙装饰你的房间”（一）常用短语1.Buy some flowers 买一些花2.Make a poster 制作一张海报3.Go shopping 去购物4.Bring
5、a pair of scissors 带一把剪刀5.Buy glue 买胶水6.Bring a brush 带一把刷子7.Make paper cuttings 做剪纸8.Bring a painting 带一张画（二）常用句型1.I will move into the new house next week. 我下周要帮到新房子。2.Could you help me decorate my house? 你能帮我装饰一下我的房子吗？3.We can buy . 我们可以买一些.4.Can you bring .here? 你能带一些.过来吗？5.Please reply to me an
6、d let me know what you think. 请给我回信，让我直到你的想法。（三）范文Dear XX:I will move into the new house next week, could you help me decorate my house tomorrow?We can go shopping first, because I want to buy some flowers and some glue.And then we can make a poster, I want to hang it on the wall.Please bring a pair of scissors here, we can make paper cuttings and stick them on the windows.They can make my house more beautiful.If possible, could you please bring a brush and painting, we can use them to paint the wall light green.Please reply to me and let me know what you think.Best wishesXXX3
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