人教版高中英语必修三课件：Unit 4 Astronomy_ the science of the stars Language points（共10张PPT）

课件10张PPT。Unit 4 Astronomy: the science of the starsAstronomy:the science of the starsLanguage pointsPeriod 31. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.随后它会变成什么没人知道，知道38-45亿年前这团尘埃才慢慢地形成一个固体的球状体。1) 句中“What it was to become ” 是一个主语从句，在句中充当主语，谓语动词用单数。 2) was to become: be to do :注定要，必定会 (sth) be to (do) 还可以表示一下意义： 表示计划安排的事 They are to get married next month. 表示责任义务 I am to call them once I reach the airport. 表示说明、规定等的规定和要求 This medicine is to be taken three times a day. 表示不会或没有大声（用于not/never, etc to be done） Anna was nowhere to be found. 表示与将来事实相反的假设（用于虚拟条件句，只能用were to do） If we were to offer you more money, would you stay.2. The earth became so violent that it was not clear whether the shape would last or not. violent: a. 暴力的,激烈的 violently adv. a. She was in violent temper.? 她暴跳如雷。主语从句，it为形式主语，whether引到真正 的主语。（注：有or not时，只能用whether 不用if） [仿写]　比赛是否被推迟目前还不清楚。 the competition would be put off.It was not clear whether3.They were in time to produce carbon… in time:及时，终于 in time (for sth/ to do sth)= not late 1) The car came to a halt just in time to prevent an accident.? 2) Can we get to the station in time?? cool 1) Please open the window to cool the room. v. adj. 凉爽的，冷静的，沉着的，冷漠的，冷淡的 be/get/seem/keep cool 2) His songs received a cool response from the public.4. As the earth cooled down, water began to appear on its surface. cool downa.凉快起来，冷却b.指人的心境“平静下来，使…平静下来”3) Don’t cover the TV until it cools down. 4) I tried to cool her down but she was still very angry when she left. 5. as well as 还，（除…之外）也可连接两个并列的谓语，其时态要保持一致。 1) He sings as well as dances. 可连接两个不定式，但后一个动词的不定式符号“to”要省略 2) My mum doesn’t allow me to play computer games as well as watch TV. 在连接两个并列主语时，谓语动词要与前一个保持一致。 3) He as well as I is playing football. 用于否定句中连接两个主语时，若位于not前，两个都否定，若位于not后，则否定前者，肯定后者。 Tom as well as Mark is not playing football now. Tom is not playing football as well as Mark now . Tom 和Mark 现在没在踢球。 Tom 现在没有和Mark踢球。（ Mark正在踢球） 6.This produced a chain reaction, which made it possible for life to develop. [仿写]　在它里面所包含的国内国际新闻，让我们了解一周来发生的大事成为可能。 Both national and international news in it that have happened during the week.make it possible for us to learn all important things AssignmentFinish EX. 1-4 on P63. ... ...