1、Unit 4 Earthquakes教学目标：语法现在完成时重难点突破：1. 现在完成时的构成：主语+have(has)+过去分词(done) 2. 用法： (1) 现在完成时用来表示现在之前已发生过或完成的动作或状态,但其结果却和现在有联系,也就是说,动作或状态发生在过去但它的影响现在还存在. 常与for,since连用. I have lost my wallet.(含义是:现在我没有钱花了.) Jane has laid the table.(含义是:简已在吃饭.) Michael has been ill.(含义是:现在仍然很虚弱) He has returned from abroa
2、d. (含义是:现在已在此地)Mary has been ill for three days. I have lived here since 1998. (2) 现在完成时往往同表示不确定的过去时间状语连用,如already, yet, just, before, recently,still, lately等: He has already obtained a scholarship. I havent seen much of him recently (lately). We have seen that film before. Have they found the missi
3、ng child yet ？(3) 现在完成时常常与表示频度的时间状语连用,如often, sometimes, ever, never, twice, on several occasions等: Have you ever been to Beijing I have never heard Bunny say anything against her. I have used this pen only three times. It is still good. George has met that gentleman on several occasions. 还可以同包括现在时间
4、在内的时间状语连用,如now, up to these few days/weeks/months/years, this morning/week/month/year, now, just, today, up to present, so far等: Peter has written six papers so far. Man has now learned to release energy from the nucleus of the atom. There has bee too much rain in San Francisco this year. Up to the
5、present everything has been successful. (4) 现在完成时与for引起的短语连用时，表达从过去开始的动作或状态延续至今，而一般过去时与“for+一段时间”连用时，只指过去的动作或状态在过去延续了多长时间。Weve stayed here for three weeks. 我们在这里呆了三个星期了。（说话时人还在）。He stayed here for three weeks last year. 他过去曾在这里呆过三个星期。（并不表示现在是否在）(5) havegoneto和havebeento的区别：前者表示某人“去某地了”，这个人已经不在这里了，常用
6、于第三人称。后者表示某人“去过某地，现在已经回来了”，常与ever等连用可用于各人称： ShehasgonetoEngland.她到英国去了。 ShehasbeentoEngland.她去过英国。 “WhereisTom?”“Hehasgonetothepostoffice.”（Tom目前不在说话处） Haveyoueverbeenthere?你曾经去过那里吗？（说话人you目前在说话处）强化训练：1. Mother _me a new coat yesterday. I _ it on. It fits me well. A.had made ; have tried B.made ; ha
7、ve tried C. has made ; tried D. made ; tried2. _ you ever _ America ? Yes, I have. A .Have ; gone to B. Have；gone in C. Have；been to D. Have； been in3.Tom _up into the tree. Look, he _ high up there ! A. has got is B. has climbed was C. got was D. climbed is4._ you _ the text yet ? Yes, we _ it two
8、hours ago. A.Did copy did B.Have copied have C.Have copied did D.Did copy had5. Why _ she _ angry ? Because he _ at her just now . A. Did get shouted B. Has got shouted C. Did get has shouted D. Has got has shouted6. _you _ the film before ? Where _ you _ it ? A. Have seen; did see B. Did see did wa
9、tch C. Have seen have seen D. Did see have seen7.You _ me waiting for two hours. I _ for you since five. A. Kept waited B. have kept waited C. Kept have waited D. have kept have waited8.Where _ John _ ? To the library. He _ there for an hour.A. Has been has gone B. Has gone has been C. Did go went D. Did be went