Module 3 Unit 2 We have not found life on any other planets yet. 现在完成—外研版八年级英语下册课件(共16张PPT)

* I’ve just made a model spaceship. Astronauts have already been to the moon. Has it arrived yet? We have not found life on any other planets yet. Presentation * 现在完成时用在什么地方呢？ 1. 当我们要表达“某人曾经做过某事”, “某人已经做了某事”等意思时, 英语要用“现在完成时”来表达。 2. 当表示动作已经完成并对现在有一定的影响时，我们也用现在完成时。 * Grammar 现在完成时的基本结构： * 肯定：主+have / has + p.p. (动词过去分词 否定：主+haven't / hasn't + p.p. 一般疑问句：Have / has +主+ p.p.？ 回答：Yes, 主+have/has No, 主+haven't/hasn't 现在完成时的谓语动词： have / has + p.p. (动词过去分词) ever before never already just yet so far 标志词 * 我父母曾经坐船去大连旅游。 她已经完成作业。 我父母未曾坐船去过大连旅游。 My parents have ever travelled to Dalian by ship. She has already finished her homework. My brother hasn’t travelled to Dalian by ship. has never travelled * 她还没有完成作业。 你父母曾经坐船去大连旅游过吗？ 她已经完成作业了吗？ Have your parents ever travelled to Dalian by ship? Has she finished her homework yet ? She hasn’t finished her homework. * 2. 要表达“刚刚做完某事” “已经做完某事”时，我们同样可以用现在完成时。例如: I have just heard the news. Astronauts have already been to the moon.可以看出