老师：同学们大家好，我是来自北京市第四中学的李伟清老师，很高兴和大家见面。今天我们一起学习的是外研版初二英语下册第三模块第三单元的内容，下面我们开始我们的学习。
学生：In Model 2, we have Learned the present perfect tense. Now let's do some revisions. The present's perfect tense is used to talk about an action which began in the past, but has continued into present moments. Look at fallen dialogue. Have you entered a writer competition? Yes, I have. What about you? congratulations i havent entered it， but i have entered a speaking competition。
老师：在这个简短的对话中，我们分别看到了现在完成时的肯定句，否定句和一般疑问句的形式。
学生：Ive entered a speaking competition。
老师：助动词 have 加过去分词entered，构成现在完成时的肯定句型式。
学生：i havent entered it。
老师：在助动词 Hive 后面加not，构成现在完成时的否定句形式。
学生：have we entered a writing competition。
老师：把助动词 have 提前，这是现在完成时的一般疑问句形式。
学生：Since we understand the structure of the present perfect tense, let's focus on the functions first. The present perfect tense is used to describe an action or situation that began sometime in the past and finished by now, or an action just finished in a very recent past.
老师：现在完成时，可以表示到现在为止已经完成或者是刚刚完成的动作。
学生：look at fallen Sentences 那么晚。
学生：i have a sweet tooth Ive eaten all the candies。
老师：我爱吃甜食，我已经把所有糖都吃了。 Number two.
学生：They have just come back.
老师：他们刚回来。这两句话中强调吃糖和回来的动作已经完成。
学生：beside。 The present perfect tense is used to express the result or effect of an action.
老师：现在完成时还可以表示过去发生的动作而带来的结果或对现在的影响。
学生：For example number three.
老师：Someone has broken the window.
老师：有人打破了窗户，结果是目前窗户是坏的。
老师：Number four i havent.
学生：Read that book yet.
老师：我还没有读那本书。结果是我不了解书中的内容。
学生：in multi three we have continued our study about the present perfect tense lets take a look at the fallen sentences number one， Ive just made a model spaceship。
老师：我刚做好一个宇宙飞船模型。
学生：number two astronauts have already been to the moon。
老师：宇航员们已经去过月球了。
学生：number three has it arrived yet。
老师：他还没到达吗？ Number four.
学生：We have not found a life on any other planets yet.
老师：我们在别的星球上还没有发现生命。
学生：its not hard to find out just already and yet are used in these sentences they play the role of emphasis ends explanation。
老师：这三个词在句中起到了强调和说明的作用。这三个词都是副词， already 表示已经， yet 表示还上， just 表示刚刚。
学生：then。 What differences can you tell from each other? Today we are going to figure out the use of the present perfect tense with a already yet. And just, let's begin with already. Already used with the present perfect means before now. We use it to emphasize that something happened before something else or earlier than expected. Array is placed between half or has and the. group。
老师：already 的意思是已经，主要有两个用法，第一，通常用于肯定句中，放在助动词 have 和 has 的后边。
学生：look at the short dialogue number one has Betty found her little pink bike yes， she has already found her bike。
老师：它已经找着了，它的自行车已经放在肯定句中。这是 already 最常见的用法。第二，表惊讶时， already 也可用于疑问句中。
学生：For example, Mi
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