八年级英语下册 Unit 11 Working with Animals Part 1重难点讲解 北师大版

专心 爱心 用心 UnitUnit 1111 WorkingWorking withwith AnimalsAnimals 一 教学内容 Unit 11 part 1 继续学习现在完成时来描述经历 二 教学重点 1 现在完成时中 ever never 的使用 2 现在完成时中的两种动词的使用 3 现在完成时与一般现在时 一般过去时的区分 4 重点词组 三 具体内容 一 Present perfect with ever and never e g Have you ever seen a polar bear I have never seen a polar bear Have you ever forgotten your homework No never I ve seen a dolphin but I ve never seen a whale 二 Two types of verbs in the present perfect 1 There are two types of verbs in the present perfect One type refers to an action that starts in the past and continues to the present The time phrases with for or since are used with this type of verbs e g He has had the book for three weeks I have worked here for two months He has been a teacher for ten years They have lived in Canada since 1997 He has taught me since I came to this school 注意 for 时间段 如 for ten years since 时间点如 since nine o clock since 时间段 ago since ten years ago since 一般过去时态从句 主句是现在完成时 e g 1 They have lived in China 1998 专心 爱心 用心 2 We have studied English 5 years 3 Joy learn Chinese since she come to China 2 The other type refers to an action that took place at a specific time in the past and cannot continue Usually for or since are not used e g He has bought a book The film has begun I have borrowed a book from the library 注意 瞬间动作不能与表示一段时间的短语连用 应改用持续性动词 常见的瞬间动词与持续性动词的转换 come go be in on go out be out leave be away begin start be on buy have borrow lend keep join be a member die be dead catch a cold have a cold become be fall asleep be asleep open be open get to know know close be closed Ex Fill in the blanks 1 这辆自行车我买了两年了 I ve the bike two years 2 He left Nanjing two years ago He Nanjing for two years 3 The monkey died last month The monkey for a month 4 A Hong long you B Two weeks A did get ill B have fallen ill C were ill D have been ill 三 现在完成时与一般现在时的区分 一般现在时表示现在较长时间内经常习惯性的动作或状态 不含有影响和结果的意味 而现在完成时强调过去发生的动作对现在的影响和结果 e g He works at our school He has worked in our school for ten years 专心 爱心 用心 四 现在完成时与一般过去时的区分 虽然动作都发生在过去 但它们强调的重点不同 现在完成时侧重于对现在的影响 而一般过去时侧重于某一动作发生在过去某个时间或某段时间 即现在完成时侧重现在的 影响 而一般过去时侧重于发生的时间 e g I have seen the film I saw the film three days ago Mr Green has bought a new computer Mr Green bought a new computer yesterday 另外 与它们搭配的时间状语也不同 一般过去时常与 ago just now last yesterday 连用 而现在完成时与 already yet just ever never for since 连用 e g She has lived here since two years ago She lived here two years ago Ex 1 I have seen the film Titanic already When you it The day before yesterday A have seen B will see C did see D did seen 2 Mr Black in China since five years ago A lived B has lived C lives D is going to live 3 We trees last Sunday So far we over 3 000 trees there A planted planted B planted have planted C have planted planted D have planted have planted 五 重点词组 1 continue to do The old man continued to work for his company after he retired Most the students will continue to study in the same school next year 2 help sb to do sth Children should help their parents to do some housework 3 make sb do sth His boss often makes him overwork 4 close to Our home is close to the school 5 feel adj 专心 爱心 用心 He always feels sleepy in the class 6 happen to She happen to be out when I called last night 课堂练习 I 用适当的词填空 never ever just yet already 1 I ve seen an elephant but I ve seen a bear 2 Have you ridden a horse No 3 Have you cleaned the room No not 4 I ve come back from the bank I m very tired 5 Have you finished your homework Yes I ve done that II 用动词的适当形式填空 1 He work in the Wildlife Park since he left school 2 Look at the polar bear over there It swim in the pool 3 The kangaroo can jump very far and it often put its baby in the front pocket 4 There be more and more trees appearing on the hill 5 you ever see a koala 6 The organization s goal is stop drugs 7 Would you like see crocodiles in the zoo There are some new comings 8 In fact it is the largest animal that ever exist 9 This kind of plane can land anywhere on land on water or even on a roof 10 The male lio