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(共11张PPT)Unit 3 Grammar and usagepresent perfect continuous tenseTeaching objects：1. identify the verb form of the present perfect continuous tense;2. work out the general rules of the present perfect continuous tense;3. use the right tenses to finish related tasksScanning (page 34)Before having the new robotic hand . The girl began to (1)__________ after looing her right hand. The old artificial hand couln’t help her because (2)________With the new robotic handOver the past three months. The girl can (3)________ and hold on to small things.. The new robotic hand is capable of (4) . ________. The new robotic hand looks very lifelike with (5) .________. The girl has rediscovered old hobbies.. The girl has become more (6) .________(1) withdraw into herself(2) she could not do simple things like getting dressed(3) move her individual fingers(4) feeling varying degrees of pressure(5) special rubber used on the outside(6) confident and outgoingLook at these sentencesScientists have been making great progress in robotic technology in recent years, ...Over the past three months I have been testing out the limits of what I can do with my new hand, ......, I have been cooking for my family again since I got my new hand.summary：have been making，have been testing out，have been cooking都是________时态，其形式为：__________现在完成进行have/has been doing现在完成进行时的用法1.表示过去发生并持续到现在的动作—How long have you been studying here —你在这里学习多久了 —I've been studying here for five years.—我在这里学习了5年了。2.表示现在经常重复的动作We've been seeing quite a lot of each other recently.最近我们常常见面。现在完成进行时与现在完成时的区别现在完成进行时：通常表示尚未完成的动作；现在完成时：则表示已完成的动作。Where have you been What have you been doing 你到哪里去了 干什么去了 I've been doing my homework.我一直在做作业。（还在做）I've finished my homework.我已做完作业了。（已完成）Practice1. I __________ (look) for a job for three months.2. Here he is! We __________ (wait) anxiously for him since last night.3. — I’m sure Andrew will win the first prize in the final.— I think so. He ________ for it for months.A. is preparing B. was preparingC. had been preparing D. has been preparinghave been lookinghave been waiting4. By the time he realizes he _________ into a trap, it’ll be too late for him to do anything about it.A. walks B. walked C. has walked D. had walked5. So far this year we _______ a fall in house prices by between 5 and 10 percent.A. saw B. see C. had seen D. have seen6. Cathy is taking notes of the grammatical rules in class at Sunshine School, where she ______ English for a year.A. studies B. studied C. is studying D. has been studying7. Danny _________ hard for long to realize his dream and now he is popular.A. works B. is working C. has worked D. had workedThank you!

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