1、Unit 4 Wildlife protection 语言点mercy【原句回放】Farmers hunted us without mercy. 农民们毫不留情的猎杀我们【点拨】1. mercy ( cn ./un.) 仁慈；宽容；怜悯They showed mercy to their enemies. The ship was at the mercy of the storm.2. Adj. merciful 仁慈的，宽容的。She was merciful to the prisoners. 【拓展】at the mercy of sb. /sth. 任 处置；对无能为力；任由摆布t
2、hrow oneself on sbs mercy 指望某人能宽容without mercy 残忍地show mercy to sbhave mercy on sb 同情 可怜某人affect【原句回放】It contains a powerful drug which affects mosquitoes. 它含有一种影响蚊子的强效药物来源:学_科_网【点拨】affect (Vt.) 影响；使感动。The change in climate may affect your health. 【拓展】Have/produce an effect on 对有影响come into effect 生
3、效；实施be of no effect 无效的；无用的decrease【原句回放】If their habitat is threatened or they cannot find enough food，their numbers may decrease如果它们的栖息地受到威胁或它们不能找到足够的食物，它们的数量就会减少。【点拨】decrease v. 产生(教材 P30)They lived on the earth tens of millions of years ago,long before humans came into being and their future see
4、med secure at that time.它们生活在千百万年前的地球上,比人类诞生早得多,而且那时它们的未来看似很安全。归纳拓展come into power 当权come into effect 生效come into action 开始行动come into office 就职come into sight 看得见come into use 开始使用No one knows when such a custom came into being.没人知道这种风俗是什么时候开始形成的。in peace 和平地；和睦地；安详地(常作状语或补语 )典例 The two communities
5、 live together in peace.A 拓展 at peace 和平的(常作表语，与 at war 相对)at peace with 与和平相处make peace with 与讲和重点句型1.“主语+be+形容词+to do” 结构。【原句回放】When scientists inspected the bones，they were surprised to find that these dinosaurs could not only run like the othersbut also climb trees科学家们观察他们的骨头时，惊奇地发现它们不仅跟其他恐龙一样能跑
6、。而且还能爬树。【点拨】they were surprised to find 是“主语+be+形容词+to do”结构。(1)“主语+be+形容词+to do”这一结构中的形容词往往是表示心理活动的，接不定式时，不定式的逻辑主语是句子的主语，主动用 to do；被动用 to be done。Im so glad to meet you here 。Your parents will be pleased to receive your present(2)“主语+be+形容词+to have done”强调动作完成或在过去发生。John Was pretty surprised to hav
7、e received such an invitation收到这样一份请柬，约翰感到相当惊奇。We were disappointed to have been told that the match had b een cancelled被告知比赛取消的消息后，我们很失望。(3)“主语+be+形容词” 后也可以接从句。The teacher Was angry that all the students had made the same mistake老师很生气因为所有的学生都犯了同样的错误。【拓展】用于这一句式结构的形容词有surprised，moved，disappointed，ple
8、ased，happy，sad，delighted，sorry ，interested，glad，worried， eager，anxious，angry 等。2. It will be long before+从句【原句回放】They lived on the earth tens of millions of years ago，long before humans came into being and their future seemed secure at that time它们生活在人类还未出现的数千万年以前，那时它们的未来看起来一片光明。【点拨】long before 早在。 。
9、 。很久之前It will be long before+从句（一般现在时） ，表示“ 要过很久才。 。 。 ” ；如果表示 “没过多久就。 。 ”，在 will 后加 not ; It was long before+从句（一般过去时，过去将来时） ，表示“过来很久才。 。 。 ”How long will it be before leaves the army ?还要多长时间才能离开军队（退役）?It will not be long before we can meet again.离我们下次再见面的时间不会很久。【拓展】before long 不久以后，相当于 soon after, shortly after. 它既可以指将来，也可以指过去，所以可与过去时或将来时连用。I hope to go there before long. 我希望不久就能去那儿。long ago 很久以前
