高中人教版 (2019)Unit 1 Science and Scientists教学演示ppt课件

这是一份高中人教版 (2019)Unit 1 Science and Scientists教学演示ppt课件，共8页。
▶The discussin is hw we can slve the prblem.讨论内容是我们如何解决这个问题。▶It is because he was careless. 那是因为他粗心。▶The reasn why I didn’t attend the cnference was that I was t busy. 我没有参加会议的原因是我太忙了。▶It sunds as if/thugh smebdy is kncking at the dr. 听起来好像有人在敲门。
【探究总结】表语从句的引导词主要有以下五种。(1)______引导的表语从句:仅起连接作用,无意义,不作任何成分,但不能省略。 (2)______引导的表语从句:表示“是否”,不能换为连词if。 (3)______引导的表语从句:在从句中充当主语、宾语、表语、状语等成分,且各有各的词义。 (4)连词 ______ 引导的表语从句: 通常只用于“This/That/It is/was because ...”结构中。当主句的主语是reasn时,其后面的表语从句要用 ______ 引导,而不能用because。 (5)连词词组 ______ 也可引导表语从句:意为“好像,仿佛”。
答案: (1)that　(2)whether　(3)wh-词和hw(4)because　that　(5)as if/thugh
【应用实践】 用合适的连接词填空。①The questin is ______ we can make gd preparatins in such a shrt time. ②As a famus singer nce said, life is ______ happens t yu while yu are busy making ther plans. ③The prblem is ______ ne less hur f sleep is nt equal t an extra hur f achievement. ④The library was ______ he spent his spare time in cllege. ⑤My wrry is ______ I can turn t in case the cmputer crashes. 
答案: ①whether　②what　③that　④where ⑤wh/whm
二、表语从句的特殊句型【观察思考】 ▶The thick smg cvered the whle city. It lked as if a great black blanket had been thrwn ver it.厚重的烟雾覆盖着整个城市,看起来好像把一条厚厚的黑色的毯子扔到了它的上面。▶We are still behind the ther classes and this is why we shuld wrk harder.我们仍然落后于其他班级,这就是我们要加倍努力的原因。
▶Frm space, the earth lks blue. This is because abut seventy-ne percent f its surface is cvered by water. 从太空中看,地球是蓝色的。这是因为地球表面大约71%被水覆盖。▶The reasn why he is late fr schl is that he missed the early bus.他上学迟到的原因是错过了早班车。
【探究总结】(1)as if/as thugh引导的表语从句:as if/as thugh意为“好像,仿佛”,引导的表语从句常跟在系动词(如seem、 appear、______、 taste、 sund、 feel、 smell等)之后。若表语从句所述的是非真实的情况,从句用虚拟语气;若所述的是事实或是极可能发生的情况,从句用陈述语气。 (2)其他形式的表语从句:①“This/That/It is why+表语从句(表结果)”表示“这/那就是……的原因”。 ②“This/That/It is______+表语从句(表原因)”表示“这/那是因为……”。 ③“The reasn why ... is______+表语从句”表示“……的原因是……”。 
答案: (1)lk　(2)②because　③that