初二英语Module 3 Journey to space Unit3课件教学教材.ppt

1. I’ve just made a model spaceship. 2. Has it arrived yet? 3. Astronauts have already been to the moon. 4. We have not found life on any other planets yet. 现在完成时(2) 当表示动作已经完成，并对现在有一定影响时，我们一般用现在完成时。同时，可分用just, already或yet加以强调或说明。例如： 我刚听到消息。 I have just heard the news. 我们已经开始探索其他行星。 We have already started to explore other planets. 宇航员还没去过月球。 Astronauts haven’t been to Mars yet. 它已经到了吗？Has it arrived yet? just, already 肯定句中 yet否定句、疑问句末 现在完成时与一般过去时的区别。 现在完成时在表达经历时只表示该事件是在现在之前的某一个时间里发生的，重点在于已完成动作对现在的影响。 而一般过去时则表示在过去某一具体时间发生的事情。例如： 我刚去过伦敦，上个月去的。 I have just been to London. I went there last month. 我已经完成家庭作业了，一小时前完成的。 I have already finished my homework. I finished it an hour ago. 在没有明确的过去时间状语时，如何判断该用现在完成时还是该用过去时呢？ 判断的标准是看该行为是否对现在有影响，也就是说该句强调的是什么。试看以下对话： A: Where have you put my book? I can’t find it. 你把我的书放哪儿去了？我找不到。 B: I put it on your desk yesterday. 我昨天放你桌子上了。 该对话中，当A 问对方把自己的书放在何处时，A 感兴趣的是现在的状态，因此用现在完成时。但是B 回答时只是说明当时放的位置，所以用一般过去时。再看下面的对话： A: Would you like to go and see the film with me tonight? 你今晚想和我去看电影吗？ B: Sorry, I have seen it already. 不好意思，我已经看过那部电影了。 对话中的现在完成时表示对结果的强调：“电影看过了，所以不想再看了。 Spaceship on Mars! Astronauts have (1) ________ been to the moon but they have not been to any other planets. However, a spaceship (2) _______ arrived on Mars and it has (3) _______ sent back photos of the red planet. Is there life on Mars? We do not know (4) ________. already just already yet Act.1 Complete the news with already, just and yet. Act.6 Complete the email with the words in the box. FROM: Liu Dan TO: Li Fang SUBJECT: I’ve found a great book. Dear Li Fang, I’ve (1) ________ finished reading a great book at school. I haven’t (2) ________ anything as good as that for a long time! It’s a story about the solar system. In the book, the writer imagines that astronauts have (3) _______ to Mars. I’ve (4) ________ thought about that before and I think it’s very interesting. I haven’t (5) _______ anyone famous in my l