状语从句的省略:
a)正确形式:
表示时间/条件/转折/让步的连词(when/while/if/unless/although/even though/even if) + 形容词短语/-ing短语/-ed短语
(逻辑主语等于句子主语) (所以when a child/ when children是错的; if + n.也是错的)
b)错误形式:表示时间/条件/转折的连词 + 介词短语/名词短语 (although just inside the orbit of Jupiter是错的)(OG10-69)
c)特殊情况:once可以加介词短语/名词短语; whatever可以加名词短语
d) 状语从句省略的条件：
第一点是毫无疑问的：逻辑主语等于句子主语
第二点也是必须的：从句的谓语必需是be(没要求主句谓语也必须是be!换句话说可以看成是省略了一个be)，且从句主语和谓语要么同省，要么同留。
pronounce固定搭配
pronounce sb/sth (as) sth/adj:
The victim was pronounced dead on arrival.
I now pronounce you man and wife.
amount
不能修饰可数名词
The amount of unemployed capital is very large.
未被利用的资金数量很大。
The railroad gives free transportation for a certain amount of baggage.
铁路免费运送的行李是有一定数量的。
It all amounts to a lot of hard work.
那一切意味着大量艰苦工作。
economic和economical
economic 是”经济上的”，economical是”节约的”。
1)economic [only before noun]PE relating to trade, industry, and the management of money
Economic growth is slow.
the government's economic policy
Economic reform is needed.
In the current economic climate (=conditions), we must keep costs down
