新概念英语第二册课件ppt第21课Lesson21

determine指“决心作某一件事而不动摇”, 常涉及范围比 较狭小的问题： 如:
We have determined to get the work done ahead of schedule. 我们已经决定要提前完成这项工作。
decided常与to, that, on, about用，表示决心；决定 ； to decide where to go 决心去哪儿 而与between, for, angainst, in favor of, that连用 ，表示判断，判决 The judge will decide the case tomorrow. 法官将于明天对案子进行判决。
sum 名词 n. [C] 1.总数,总和,总计[the S][(+of)] She paid the sum of $200 for dresses. 她买衣服总共花了二百元钱。 2.【数】和[the S][(+of)] 3.金额;一笔[(+of)] He earned a large sum of money. 他赚了一大笔钱。 4.概要;要点[the S][(+of)] 5.算术题;运算 The boy is good at doing a sum in his head. 这男孩善于心算。
Mad or not?
How does the writer feel about aeroplanes? What has made most of his neighbours leave their homes?
Pre-task
Why does people think the writer is mad?
decide和determine 之间的区别： 都有“决定”的意思。 decide 指“经过询问、研讨和考虑之后, 在几种可能 的选择之中作出决定”,decide 最为普通： 如: She decided to leave here on Sunday instead of Monday.
她决定星期日而不是星期一离开这里。
☆mad adj. 发疯
be mad/crazy about:为……而疯狂 be mad at sb eg:Don't be mad at him。 别怪他（不关他的事）。
go+adj:变得 go mad/crazy/insane/bananas
Don't fight with him, he is a mad man. 别跟他打架, 他是疯子。
例句：He was late for school for some reason. 由于某种原因，他上学迟到了！ He didn't tell me the answer for some reason. 由于某种原因，他没有告诉我答 案!
Last year,however,it came into use。 come into use:投入使用
及物动词 vt. 1.计算...的总和[(+up)] 2.总结;概括;概述[(+up)] The story may be summed up in one sentence. 该故事可以用一句话来概括。 不及物动词 vi. 1.共计[(+to/into)]
☆determined adj.
determined adj. 坚定的，下决心的 I am determined to stay here.我决定留在这儿。 be determined to do sth. 决心做某事 v.determine on 决定 v.determine upon 决定 determine sb. against sth. 使 某人决定不做某事 determine sb. to do sth. 使某人决定做某事
come into:进入得到、获得财富
1、They put this method into use。 2、This method comes into use。 3、This method is put into use。
The airport was built years ago,but for some reason it could not be used then.
for some reason:由于某种原因 some+可数名词单数：某一 some book some+可数名词复数：一些 some books some+不可数名词：一些 some water
I live near an airport and passing planes can be heard night and day.
1、passing planes：现在分词做定语 sleeping baby:正在睡觉的小孩 waiting car:正在等待的 2、day and night: 日日夜夜 例句：I will sit by her bedside day and night. 我会日夜守在她的床边。
☆
sum n.量
大量百度文库a great many/a great number of+可数名词 复数 a sum of:一笔
a large sum of:大量的，喜欢跟钱连用
a large sum of money a large amount of:许多 plenty of（注意：前面没有a）足够的
reason [’ri:zən] n.原因
for this reason:由于这个原因
For what reason? 是为了什麽原因？ bring sb. to reason 使某人讲理
Aeroplanes are slowly driving me mad.
☆drive sb mad:逼某人发疯 例：Sometimes it's enough to drive you mad if you are stuck in a traffic jam during the rush hour. 有时在交通高峰期被困足以使人发疯 The noise outside is driving me mad.