高一英语必修2 unit 4知识点.pptx

Unit 4 Language Points
1. decrease vi & vt 减少;(使)变小或变少 n. 减少;降低(P70)
(反) increase 增加
decrease to …减少到……
decrease by …减少了……
decrease from…to…从……减少到……
on the decrease 正在减少
1. 去年我校学生的数量减少到了2000人。
The number of students in our school decreased to 2000 last year.
2. 该市人口减少了百分之30.
The population in the city decreased by 30%.
2. die out 灭绝;逐渐消失;逐渐熄灭(P70)
die of 因……而死(一般指死于内因,如疾病、饥饿、情感原因等)
die from 因…..而死(一般指死于外因,如外伤、车祸、污染等)
die away (声音、风、光等)慢慢变弱;渐渐消失
die down (兴奋、火等)渐弱;渐熄;平息
科学家们说一个世纪以前那些植物就灭绝了。
The scientists said that those plants died out a century ago.
3. loss n. 损失;遗失;丧失(P70)
at a loss 不知所措;茫然
be lost in 陷入……;迷失于…….
1. 她很胆小,完全不知所措。
She is timid pletely at a loss what to do.
2. 他们陷入了沉思。
They were lost in thought.
4. reserve n. 保护区 v. 保留;储备;预定(P70—71)
reserve sth for …为……预定/保留/储备某物
be reserved for …为…….而预定/保留;留给……
这个问题须留待进一步讨论。
The question must be reserved for further discussion.
5. in danger of 在危险中;垂危(P71)
be in danger 有危险的;在危险中
out of danger 脱离危险
in face of danger 在危险面前
1. 他有生命危险。
He life is in danger./ He is in danger of losing his life.
2. 面对危险,他表现得十分勇敢。
He showed great bravery in face of danger.
6. respond vi. 回答;响应;做出反应(P71)
respond to 对……作出回应
respond that …回答说
他没有对我的问题做出回应。
He didn’t respond to my question.
7. relief n. (痛苦或忧虑的)减轻或解除;减轻痛苦的事物;缓解;宽慰(P71) v. relieve 解除;减轻
in relief 如释重负
to one’s relief 令某人感到欣慰的是
relieve sb of …帮助某人减轻……
1. 听到我已经通过了考试后,我如释重负地笑了。
I smiled in relief after I heard that I had passed the exam.
2. 令我们感到欣慰的是孩子们安然无恙地(safe and sound)回来了。
To our relief, the children came back safe and sound.
burst into + n. 突然进入(某种状态);闯入(P71)
burst out crying = burst into tears 突然哭起来
burst out laughing = burst into laughter 突然大笑起来
burst into anger 勃然大怒
9. certain adj. 确定的;一定的;某一;某些(P72)
be certain to do sth 确定做某事
be certain of /about sth 对某事有把握;确信某事
It’s certain that …一定能…….;肯定会……
for certain = for sure 确定无疑的
1. 他确定可以通过考试。
He is certain to pass the exam.
2. 这些犯人肯定会被判处死刑。
It’s certain that these p