How long have you been collecting shells课件1.ppt

Unit 6 How long have you been collecting shells? 现在完成时态的构成；have/has + done 过去分词的构成 (1)规则动词的过去分词和它的过去式相同,即在原形后加－ed（以e 结尾的加－d） work- worked arrive- arrived clean- cleaned live - lived greet - greeted like - liked enjoy- enjoyed believe - believed （3） 动词过去分词的变化形式大部分与动词过去式形式相同，但是不规则动词的变化形式没有规律，需要记忆，比如： see-saw-seen; be-was, were-been eat-ate-eaten; break-broke-broken go-went-gone; take-took-taken send-sent-sent; find-found-found make-made-made; have-had-had 1.just常用于肯定句中，放在have / has后 He has just come . 2.never表示否定, 放在have / has后, He has never visited the Great Wall. 3.ever用于疑问句中,句型为: Have / Has＋主语＋ever ＋过去分词？ “…曾经……过吗？”用于询问某人过去历。 Have you ever been to the farm？ 4. before用于句末. The woman has never heard of that before. 5. yet 用于句末或not 之后. Has the train arrived yet? No,not yet. 6. already用于肯定句, have / has 之后或句末. We have already finished it. 7. so far用于句首或句末. So far, we have visited the moon. 选词填空 1.Have you done your homework_______? (for , just , yet) 2.I have______been to Chengdu. (ever , never , yet) 3.He has________washed the dishes. (already , ever , for) 4.He has worked there______he left school. (already , just , since) 5.Have you cleaned your room_______? (for , just , yet) 6.She has known Sam______ nine years. (for , never , since) 7.They have______arrived. (ever , just , yet) 8.Have you_____ ridden a horse? (ever , for , yet) 9.She has known Fred______ they were at primary school. (already , just , since) 10.We have not completed the project_____. (already , for , yet) 用Have been to, have gone to, have been in 填空 Mike and his parents __________ the north for half a year. Mum is not at home now. she _________ the shop. ______ you ever _____ to kunming ? Never. Where _____ you ______ these days? Has Jim arrived yet? Yes, he _______ here for several day