Welcome to our class现在完成时态 present perfect时态 （tense）不同时间发生的动作， 动词要用不同形式。已学习过的时态已学习过的时态1.v. 2.v+s/es（三单现） am/is/are+v-ing1.will/shall+v.2.am/is/are going to +v.1.v-ed（规则动词）2.不规则动词was/were+v-inghave/has been v-ing判断下列句子的时态1.She works in a factory.2.I was doing my homework at this time yesterday.3.We are going to have a picnic this Sunday.4.They held a sports meeting last week.5.Are you helping your mother ？6.I have been sitting here for an hour.一般现在时过去进行时一般将来时一般过去时现在进行时现在完成进行时现在完成时1.过去发生的动作对现在造成的影响或结果。和already，never,ever,just,before,yet等状语连用。2.过去已经开始，持续到现在的动作或状态，与for或since引起的一时间状语连用。动词构成：have/has+v过去分词have breakfastI have just had my breakfast.(现在我不饿)I’m not hungry nowmoved herein 2004I still live hereI have lived here for three years.I have lived here since 2004/three years ago. nowpast 现在完成时动词构成 have /has+v 过去分词 助动词否定haven’thasn’t疑问Have you…?Has he…?规则变化：过去式和过去分词的变化相同一般在动词词尾直接加ed。 以不发音的e结尾的动词后面加d。 以“辅音字母 + y”结尾的动词，变y为i，再加-ed。词尾只有一个辅音字母的重读闭音节动词，要双写辅音字母，再加-ed。不规则变化：5. 以不变应万变。如：let → let → let; put → put → put; read → read → read6. 若中间有双写e，则去掉一个e，单词末尾再加t。如：feel → felt → felt; |
