七年级英语We’re trying to save the manatees课件.ppt

Unit 15 We’re trying to save the manatees! 1b Listening 2a Listening Tapescript Boy: Where do they live? Man: Their favorite habitat is the water under the trees in mangrove swamps. Boy: And why are they endangered? 如: already, yet, ever, never, just, before, once, twice 等连用, 也可以和包括现在在内的时间状语, 如these days, today, this year, so far 等连用。 2. has / have been to 去过某地表示某人的一种经历,可与once, twice, already, ever, never等连用。 have/has gone to 去某地了,说话时某人已离开此地,在去某地的途中或已在某地。 have / has been in 逗留在某地 (已经一段时间)。 常和for ten days, since I came here等连用。 join the army ---- be in the army be a soldier join the Party ---- be in the Party be a Party member It has been two years since Jim bought this pen. Jim bought this pen two years ago. 2. 李雷自从2003年就参军。 3. 那部电影开始30分钟了。 4. 自从两年前这家商店就开了。 5. 那个老人已经死了五年了。 6. 莉莉六年前就离开家了。 现在完成时和一般过去时的区别： 现在完成时所表明的是过去发生的动作对现在的影响, 强调的是现在的情况, 不可以和表示过去的时间状语 yesterday, in 1991, three days ago last time, last night等连用。 一般过去时表明的是过去发生的事实, 和现在不发生关系。 ??????????? ? 5. 现在完成时中的 for 与 since for + 时间段与延续性动词的现在完成时连用 since + 时间点/从句。 I have kept the library book for a week. = I have kept the library book since a week ago. It is /has been + 一段时间 + since... 自从某事发生已有一段时间了。? eg. It is /has been two years since my brother joined the army. ?注意: 1. since 引导的从句中动词用过去时。 2. when 引导 的特殊问句不与现在完成时连用。 3. have got,has got 虽然是现在完成时,但 have got = have has got = has 1. Its a long time since we ______ (meet) last time, isnt it?????????????? ? 2. --I know you __________ (choose) a picture book among these. ? --Yes,Have a look at it, please. ????????? ? 3. So far, spaceships without people __________ (reach) the moon and some other parts of the universe. ???????????? ? 4. My father ____ home for nearly three weeks. A. has gone away from????? B. has left C. has been away from????? D. went away ????????????? ?