8B U1-2 现在完成时讲解及配套精练.doc

牛津英语八年级下册1-3单元语法 一、现在完成时构成 助动词have (has) + 动词的过去分词 注：has 用于第三人称单数，have 用于其他所有人称。规则动词的过去分词变化与过去式相同，不规则变化则须单独记忆。 二、现在完成时用法 1. 现在完成时表示过去发生或已经完成的某一动作对现在造成的影响或结果。这种用法的特点是动作不延续(汉语中常用“已经”、“过”、“了”等表达），通常与表示包括现在在内的时间副词 just，already, before, yet, never, ever，等状语或表示次数的短语（three times等）连用。例如： ① I have never heard of that before. ② Have you ever ridden a horse? ③ She has already finished the work. ④ Have you milked the cow yet? Yes, I have done that already. ⑤ I’ve just lost my math book. yet用于否定句和疑问句，already常用于肯定句，但若将含有already的句子改成否定句或疑问句时，同时将already改成yet，常位于句末。 小试身手： You ______ that question three times. A. already asked B. have already asked C. already have asked D. asked already 2. He _______ his homework and is now listening to music. A.. finishes B. has finished C. finish D. is finishing 3.--- ______ you______ your homework yet? ---Yes, I _____ it just now. A. Did; do; finished B. Have; done; finished C. Have; done; have finished D. Will; do; finish 4. The sand storm weather ______ in Beijing several times this year.  A. happen B. happened C. has happened D. have happened 5．Miss Brown _______ to the Great Wall twice． A．have been B．has been C．have gone D．has gone . I_______ already _______ (see) the film. I _________ (see) it last week. 7. ----- _______ he ________(finish) his work today ? ------Not yet . 8. -----_______ you ever ________(eat ) chocolate sundaes ? ----No, never. 9. My father ____ just ________ (come) back from work. He is tired now. 10. Mary _____ already _______ (have) her supper. 11. ______ you _______ (read) today’s newspaper yet? 12. They _____already_____(do) their homework. But they don’t know what_____ (do) next. 13. She____________ (not read) this book before. 14. ____ you ever __________ (travel) on a train before? 15. --- ____ Wei Hua _____ (come) yet?  ---Yes. She_______ (come) already. She ______ (come) just now. 2.现在完成时表示过去开始的动作或状态一直持续到现在，也许还会持续下去。此时常和表示延续的时间状语连用。 如for+一段时间、since时间点 ，over the