新概念 2 Lesson 53.pptVIP

Lesson 53 Emphases and difficulties The simple past and the present perfect, simple and continues --一般过去时，现在完成时和现在完成进行时 Words often confused Throw to, throw at throw away Quite quiet Cause reason Drop fall New words and Expressions cause n. 原因；导致某事发生的人、事等,表示具有明显因果关系的原因。 v. 引起,导致 大雨是造成洪水的原因。 The heavy rain was the cause of the flood. reason有时与cause换用，Reason 多与for连用,cause 多与of连用。 They are trying to find out the reason for the forest fire. The cause of the fire is dry. Accidentally=by chance adv.意外地，偶然地 回家的路上，我偶然碰见以前的同学。 on my way home, I come across my previous classmate by chance. accidental a. accident n. power n.电力，体能，权力 electric power电力 water power水力 brain power脑力 Solve v.解决；解答，解释 solve a problem解决问题 solve a mystery 解答一个迷团 Drop vt. vi.，表示“（使）掉下”、“（使）落下”、“放下”： 当他走过那棵树时，一个苹果从树上掉了下来。 As he walked past the tree, an apple dropped from it. 那侍者掉了一把叉子。 The waiter dropped a fork. fall vi. 无宾语, 强调的是掉下来的概念,动作,“落下”、“（雨、雪）下”、“降”、“跌倒”、“摔倒”： 我摔倒了并受了伤。 I fell and hurt myself. 请拿住这花瓶，别让它倒了。 Please hold the vase and dont let it fall. 秋天叶落时，我就会回来。 When leaves fall in autumn, Ill come back. Discussion 1 Are you afraid of fire? 2 What will you do if you are caught in a fire? How to protect yourself? Let’s listen to the tape!! What caused the fire? A snake which had been dropped on to the wires by a bird. Text study At last firemen have put out a big forest fire in California. Since then, they have been trying to find out how the fire began. put out =extinguish“扑灭”、“熄灭”、“关掉”等含义： Far water does not put out near fire.? 【谚】远水救不了近火。 since then 从那时起 find out--经过研究、努力等“发现”、 “找出” “查出”： We shall find out the truth early or late.? 我们迟早会查明事实真相。 Forest fire are often caused by broken glass or by cigarette ends which people carelessly throw away.  They were also quite sure that a cigarette end did not start the fire. start作及物动词时可以表示“使……发生”、“引起”。 be sure that ···很确信 我肯定把钱放在衣袋里了。 I am sure that I put t