[课件]unit+4 Astronomy3.ppt

Unit 4 Astronomylanguage points 1. What it was to become was uncertain until … 2. The earth became so violent that it was not clear whether the shape would last or not. 1) violent 猛烈的，激烈的 violence n. 暴力 2) last v. 持续 好天气只会持续几天 The fine weather only lasted for a few day 友谊长存　 Friendship lasts forever.　 2. They were in time to produce carbon,…, which were to make important is in time: sooner or later; eventually 迟早;最终 我迟早会遇见他. I’ll see him in time. in time (for sth. /to do sth.): not late及时；不迟 她会及时回来准备晚餐. She will be back in time to prepare dinner. 你认为我们能及时赶上火车吗? 与time相关的短语: on time 按时;准时 In no time 立刻,马上 at times 有时 at a time 每次;依次 once upon a time 从前 与will do, be about to, be going to do 区别: Will do/shall do 多指客观上将要发生的动作,句中通常有一个表将来的时间状语. The sports meeting will be held next Saturday. 2) Be about to do 表即将正要做某事,句中不加时间状语,但可以和when连用. I am about to leave. Be going to do 表事先经过考虑打算去做或有明显迹象可能发生的事 It looks as if it is going to rain 3. It was not immediately obvious that water was to be fundamental to the development of life. It was (not ) obvious that…显而易见的… Be fundamental to 对于…来说是必要的 4.This produced a chain reaction, which made it possible for life to develop. Chain reaction 连锁反应 Make it possible for life to develop. 使生命的发展成为可能 make it + adj./n. sb. /sth. to do sth. 组长让我们可以一起合作. The group leader ____________________________ 老师让他们跟容易地明白那个问题. The teacher _______________________________. 5. …allowed the earth to dissolve harmful gases… Allow … to …= permit …to do… Harmful adj. Opp: harmless harm n. be harmful to sb./sth. = do harm to sb. /sth. 对…有害 2) encourage v. 鼓励 老师鼓励我们上课说英语. The teacher encourages us to speak English in class. 6. Later when the plants grew …for the first time. For the first/second/third …time 第一/二/三…次 在句子中作时间状语 我那是第一次见到她. I saw