Unit 1 Grammar and usage

Unit 1 Grammar and usage

Answer Have the police found Justin yet? How long has he been away from home? Has anyone seen aliens in the article? How many times has Mavis Wood seen them?

The present perfect tense : Revise the usage of the present perfect tense Revise the differences between the present perfect tense and the simple past tense.

He/She has been to China Dinosaurs Park once. already seen the film “Titanic”. never driven a car. already/just cleaned the classroom. already learned how to use the computer. not borrowed your library book yet.

现在完成时用法（一） We use the present perfect tense to talk about things that happened in the recent past, but are connected to the present. We use it with time expressions such as: already, yet, ever, never, just, lately, recently, once, twice, … several times, many times, so far, in the past/last …years

Translate the following sentences: 根据村民们的说法，他们已经看见不名飞行物许多次了。 最近，你收到你朋友的来信了吗？ 3. 在过去三、四百年期间，世界的人口数量增长得非常快。 4. 到目前为止，中国有多少宇航员乘宇宙飞船到太空旅行过？ 5. 他还没有读完那本小说。 在过去三、四百年期间，世界的人口数量增长得非常快。 According to the villagers, they have seen UFO many times. Have you heard from your friend recently? In the past three or four hundreds years, the world’s population has grown very fast. So far, how many astronauts in China have travelled in space by spaceship ? He hasn’t finished reading the novel yet.

现在完成时用法（二） He has read the novel for three days. /since three days ago. He/She has learned English for over five years. He/She has lived in Changzhou since he/she was born. They have known each other since July. 现在完成时用法（二） We use the present perfect tense to talk about something that started in the past, and is still happening now. We often use it with time expressions such as: for , since , we should also use continuous verbs.

Judge the following sentences “T” or “F”: ( ) 1. He has bought the new watch since last Sunday. ( ) 2. Kate has been in Beijing for two days. ( ) 3. Mr. Brown has left his hometown for ten years. ( ) 4. I have borrowed the book for two weeks. ( ) 5.His brother has joined the League since three years ago. F He has had the new watch since last Sunday. T F Mr. Brown has been away from his hometown for ten years. F I have kept the book for two weeks. F His brother has been in the League since three years ago. His brother has been a League member since three years ago.

现在完成时的用法 Conclusion: 1. 表示动作发生在过去，但强调的是现在的结果或对现在的影响。常与already, yet, ever, never, just, recently, lately, so far, in the past/last … years等副词或时间状语连用。 2. 现在完成时可用来表示从过去某一时刻开始一直持续到现在的动作或状态，常和for 或since 引导的时间状语连用，也可与since 引导的时间状语从句连用，谓语动词通常用持续性动词。

现在完成时与一般过去时的区别： just now She has already finished reading the book. She finished reading the book just now. 现在完成时与一般过去时的区别： 注意（一）：现在完成时强调过去发生的动作对现在造成的影响，而一般过去时强调过去的动作，不强调过去的动作与现在的关系，现在完成时不能与表示过去的时间状语连用。

He has been an English teacher for over ten years. He was an English teacher for over ten years, but now he is a businessman. 注意（二）：一般过去时虽也可指过去动作的持续，但它不能指动作一直延续到现在（只能是延续到过去某一时间）

Choose the right sentence in each group: 1. He has started to work at 2:30 pm. He started to work at 2:30 pm. 2. His brother joined the army in 2001. His brother has joined the army in 2001. 3. I have lived in the countryside for 16 years and now I live in the city. I lived in the countryside for 16 years and now I live in … 4. My grandpa died 15 years ago. My grandpa has died 15 years ago. 5. They have just left the room. They have left the room just now.

Rewrite the following sentences: He has had the new watch since one week ago. I have kept the book for two weeks. This factory has been open since ten years ago. 4. My brother has been away from school for five years. He bought the new watch one week ago. It’s (has been) one week since he bought the new watch. I borrowed the book two weeks ago. It’s (has been) two weeks since I borrowed the new watch. This factory opened ten years ago. It’s (has been) ten years since this factory opened. My brother left school five years ago. It’s (has been) five years since my brother left school.

You are writing about a friend’s travels in your diary You are writing about a friend’s travels in your diary. Complete your diary entry using the correct forms of the verbs in brackets. My friend Jack has just sent me an e-mail, telling me about his travels around the world. He ______________ (just be) to Qomolangma Base Camp and _________ (see) a Yeti there. He is still very excited about it. He __________ (visit) the Great Pyramid in Egypt too. He says that he _________ (love) Egypt but he ___________ (not visit) all the pyramids yet. He ________ (swim) in Loch Ness, but luckily he ____________ (never meet) the Loch Ness Monster! He __________(dive) in the Indian Ocean many times looking for treasure. Although he_________ (find) many sunken ships, he ___________ (not find) any treasure._______ he _____ (be) to the Great Wall before? I’m not sure—but I have! has just been saw has visited loves hasn’t visited has swum has never met has dived has found hasn’t found Has been

Homework: Revise the present perfect tense. Finish multiple choice on the paper.

Thank you Goodbye!