1、單元：Unit 1 Tales of the unexplained板塊：Grammar and usage 2Thoughts on the design:Learn the differences between the present perfect tense and the present perfect continuous tense.Teaching objectives:1. Learn how to form and use the present perfect tense.2. Understand when the present perfect continuous

2、 tense is used in sentences.Teaching procedures:Step 1 Compare the two tenses1. We use the present perfect tense to talk about an action completed in the recent past, and the present perfect continuous tense for an action that started in the past and is still happening. 現(xiàn)在完成時(shí)和現(xiàn)在完成進(jìn)行時(shí)都表示動(dòng)作從過去開始，但現(xiàn)在完成

3、時(shí)可表示事件或動(dòng)作剛結(jié)束，而現(xiàn)在完成進(jìn)行時(shí)則強(qiáng)調(diào)動(dòng)作仍在繼續(xù)。1) Li Jia has read a book about Stonehenge. （表示她已經(jīng)讀完了。)2) Li Jia has been reading a book about Stonehenge. (表示她仍在讀。)2. We can use the present perfect tense for repeated actions, and the present perfect continuous tense for non-stop actions.We usually use the present pe

4、rfect tense to ask questions beginning with how many/much, and the present perfect continuous tense to ask questions beginning with how long.現(xiàn)在完成時(shí)可表示反復(fù)發(fā)生的動(dòng)作，提問時(shí)用how many / how much。而現(xiàn)在完成進(jìn)行時(shí)則表示持續(xù)的、不間斷的動(dòng)作，提問時(shí)用how long。1) How many times have you visited Egypt this month? 你這個(gè)月去了埃及幾次？I have visited Egypt

5、 twice this month. 我這個(gè)月去了埃及兩次。2) How long have you been touring Egypt? 你在埃及旅游多久了？I have been touring Egypt for two months. 我已經(jīng)在埃及旅游兩個(gè)月了。3. We can use either a state verb or an action verb with the present perfect tense but we usually can only use an action verb with the present perfect continuous te

6、nse.現(xiàn)在完成時(shí)可以用表示狀態(tài)的動(dòng)詞或表示動(dòng)作的動(dòng)詞做謂語。而現(xiàn)在完成進(jìn)行時(shí)則只能用表示動(dòng)作的動(dòng)詞做謂語。1) I have had this camera for five years. (had是表示“擁有”狀態(tài)的動(dòng)詞)2) I have taken photos of UFOs with this camera. (taken是表示動(dòng)作的動(dòng)詞)3) I have been taking photos of UFOs with this camera. (taking是表示動(dòng)作的動(dòng)詞)4. We use the present perfect tense, not the present

7、 perfect continuous tense, with the words like never, yet, already and ever. 現(xiàn)在完成時(shí)的句子中可以用像never、yet、already和ever這樣的詞，而現(xiàn)在完成進(jìn)行時(shí)的句子中則不可以用這樣的詞。Exercise:(T) I have never visited America.(T) I have already been to America.(F) I have never been visiting AmericaStep 2 Practice 1. Part A: Read the conversati

8、on and circle the right words to complete it.Answers: (1) heard (2) been doing (3) been researching (4) been doing (5) started (6) done (7) read (8) found (9) started (10) been doing (11) been making2. Try to answer the following questions according to the comic strip.(1) Where do you think the boy

9、has been waiting? (He has been waiting at an under-ground station.)(2) What have the aliens been traveling in? What does it look like? (They have been traveling in an UFO. It looks like a saucer.)(3) Who else have the aliens talked to?(They probably have talked to animals or plants on the earth as well as creatures on other plants.)(4) What other planets have the aliens visited?(They have v