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课件网) Module 3 Journey to space Observe the following sentences carefully and pay attention to the words in color. I've just made a model spaceship. Has it arrived yet Astronauts have already been to the moon. We have not found life on any other planets yet. 5. But no one has been to Mars yet. 6. Scientists have not discovered life on Mars yet. 7. I haven't started yet because I'm not sure how to make it. 8. They have just received a message from one of our spaceships. 1. I ____ ____ _____ (make) a model spaceship. 2. ____ it _____ (arrive) ____ 3. Astronauts _____ _____ _____ (be) to the moon. 4. We _____ ____ _____ (not find) life on any other planets ____ . have just made Has arrived yet have already been have not found yet go Ready 5. But no one ____ _____ (be) to Mars ____ . 6. Scientists ____ ____ _____ (not discover) life on Mars ____. 7. I ____ ____ _____ ____ (not start) because I'm not sure how to make it. 8. They ____ _____ _____ (receive) a message from one of our spaceships. has been yet have not discovered have not started yet have just received yet Focus on 用法 just，already和yet在现在完成时中的用法； 现在完成时与一般过去时的区别。 1. I have just heard the news. 我刚听到消息。 2. Astronauts have already been to the moon. 宇航员已经去过月球了。 3. We have just started to explore other planets. 我们才刚刚开始探索其他行星。 Present perfect with already and just 两者都用于肯定句中，一般置于have/has之后, V-ed 之前 just “刚刚” already “已经” 1. The scientists have not heard from it yet. 科学家还没有收到它发出的信息。 2. Man has not discovered any life in space yet. 人类尚未在太空中发现任何生命。 3. Have the children come home yet 孩子们已经回家了吗？ 置于句末 Present perfect with yet yet 用于 否定句: “还未（以后可能会）” 疑问句:“已经” 一、构成不同 一般过去时：主语 + 动词过去式 现在完成时：have/has + been/V-ed 1) They lived here in 2011. 他们2011年住在这里。 2) We have lived here for three years. 我们已经在这里住了3年了。 1. I have just been to London. I went there last month. 我刚去过伦敦，上个月去的。 2. I have already finished my homework. I finished it an hour ago. 我已经完成家庭作业了，一小时前完成的。 二、用法不同 三、时间状语不同 1. Did you watch that film last week 你上周看那部电影了吗？ 2. She came back yesterday. 她是昨天回来的。 3. His father has been a teacher since 1968. 他父亲从1968年以来一直当老师。 4. — Have you ever been to London — No, I have never been there. — 你曾经去过伦敦吗？ — 没有，以前从没去过。 现在完成时常与表不确切的时间副词连用。 一般过去时常与表过去的具体的时间状语连用； 当 A 问对方把自己的书放在何处时，他强调的是现在找不到了，故用现在完成时。但B的回答只是说明当时放的位置，故用一般过去时。 A: Where have you put my book I can't find it. B: I put it on your desk yesterday. 当没有明确的过去时间状语时，判断该用现在完成时还是一般过去时的标准是：看该行为是否对现在有影响，即该句所强调的是什么。 A: Would you like to go and see the film with me t ... ...
