Unit3 society and Family life
Learn to talk about trends(学习谈论发展趋势)
连接词.But 和so
描述习惯
描述家庭生活和关系
1.主要的描述词 — 动词.
Verbs: rise . fall . increase . decrease . etc.
(1). 可以使用表示增减的动词的一般过去时来描述过去某一时间或某一阶段发生的变化趋势.
Inflation fell from 8% in 1992 to 6% in 1995.
(2). 动词的现在完成时则可以用来描述发生在过去.但现在还在持续的变化趋势.
In general. Unemployment has risen.
There has been a slow fall in inflation since last October.
Learn to talk about trends(学习谈论发展趋势)
2. 限定修饰变化趋势的词语 — 副词和形容词.
adj : sharp . slow . slight. etc.
adv : sharply . slowly. slightly . etc.
Unemployment has gone up slowly.
There has been a slight rise in population.
注意:
副词一般放在动词之后,而形容词一般放在名词之前.
3. 与描述变化趋势连用的介词.
. From 用来描述变化的起始点.
The average wage fell from $8 per hour in 1992 to
$ 7 in 1995.
(2) . To 用来描述变化的终止点(例句同上)
(3) . By 用来描述量的变化.
The average wage fell by $1 between 1992 and
1995.

连接词 but 和 so
But 表示转折关系(已在unit1 中学过)
So "因此",作为连词常用来连接因果关系分句
一般放在结果分句的前面,与此用法类似的还有
and so.
There has been a steady rise in production ,so/and
so we have employed more staff.
描述习惯
在描述习惯时,常与表示频度的副词连用,如
Always , now and again . Once a week .
Every day . 等.
I often go swimming.

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