(
课件网) 2026 Unit 9 Section Ⅳ Grammar 英 语 内容索引 走近新课·一起感知 语法探究·一起思考 随堂练习 走近新课·一起感知 语法感知 阅读下列句子,并按照画线部分的时态进行分类 1.Natural cloning has been going on for generations. 2.For example,gardeners have been using a form of cloning when they take a cutting from a plant and place it in a suitable medium,such as soil. 3.For years,there had been attempts to clone animals artificially. 4.After Dolly,scientists have cloned more than 20 mammal species,including camels,cattle,deer,dogs,goats and mice. 5.In comparison with other species,cloning primates has proved to be “much harder”. 6.Dr.Sun Qiang,director of the research team,said they had been wholly devoted to the research and had been taking care of more than 1,000 monkeys 24 hours a day,7 days a week for more than 5 years. 7.There had been a number of failures before they eventually found a way to successfully clone a monkey. 8.The successful cloning of primates has led to worldwide praise as a huge breakthrough. 9.Many people fear it could be the next global epidemic,especially as scientists who have gone into detail studying tissue samples from the bodies of people who died of the 1918 Spanish Flu have proved that bird flu is a modern adaptation of that virus. 10.Families who had only just got through the war now had to bury their loved ones who had died of the disease. 现在完成时: 现在完成进行时: 过去完成时: 过去完成进行时: 4 5 8 9 1 2 3 7 10 6 语法探究·一起思考 知识脉络 语法精讲 完成时 在英语中常用的完成时有四种:现在完成时、现在完成进行时、过去完成时和过去完成进行时。 一、现在完成时 1.构成方法 have/has+动词的过去分词。第三人称单数用has,其他人称用have。 2.用法说明 (1)表示过去发生并结束的动作对现在造成的影响或结果。常与时间状语already,yet,never,ever等连用。 Well,Daniel,have you ever felt nervous on stage 哦,丹尼尔,你在舞台上曾经感到紧张吗 (2)表示从过去到现在这段时间之间经历过的事情。常与since、ever since、for+一段时间、so far、up to now、in/over the past+一段时间等连用。 The Xi’an City Wall is one of the most complete city walls that has survived China’s long history. 西安城墙是中国漫长历史上保存下来的最完整的城墙之一。 3.现在完成时与一般过去时的区别 现在完成时强调此事对现在的影响,着眼点在现在。一般过去时表达过去某时发生的事情,强调“过去”。 I (have) bought a new English-Chinese dictionary. 我买了一本新英汉词典。 I bought a new English-Chinese dictionary yesterday. 昨天我买了一本新英汉词典。 二、现在完成进行时 1.构成方法 have/has been+动词的现在分词,第三人称单数用has,其他人称用have。 2.用法说明 (1)表示发生在过去一直持续到现在的动作。这个动作可能刚停止,也可能仍继续进行下去,动词常用延续性动词,并常带有表示动作起始时间的状语,如since last week、since 1992等,或是since引导的时间状语从句;也可以是带有表示时间段的状语,如for an hour、for a few days、these days等。 People have been pouring into stadiums since the days of ancient Greece. 从古希腊时代开始,人们一直不断地涌入体育场。 (2)表示 ... ...
