0910AW SPECTACULAR 之【SU & SY SO】第三期——冠词、数词

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冠词
用在江河、湖泊、海洋、山脉、群岛等的名称前。例如：     
the Yellow River 黄河the Black sea 黑海     
the West Lake 西湖 the Himalayas 喜马拉雅山     
the Tianshan Mountains 天山山脉 the Indian Ocean印度洋     

用在乐器前面。例如：     
the piano 钢琴   the violin 小提琴     

用在单数可数名词前表示一类人或物。例如：     
The tree is a kind of plant. 树是一种植物。     
The camel is a useful animal. 骆驼是一种有用的动物。     
The computer is an interesting tool. 电脑是一种有趣的工具。

在星期，月份，季节，节日前。例如：on Sunday，in March，in spring，on Women’s Day
(特例：如果月份，季节等被一个限定性定语修饰时，则要加定冠词：He joined the Army in the spring of 1982.)

在学科名称，三餐饭和球类运动名称前。例如：I have lunch at school every day.
特例：当football，basketball指具体的某个球时，其前可以用冠词：I can see a football.我可以看到一只足球。Where’s the football？那只足球在哪儿？(指足球，并非“球类运动”)

用与不用冠词的差异

in hospital住院/in the hospital在医院里
go to sea出海/go to the sea去海边
on earth究竟/on the earth在地球上，在世上
in front of在……(外部的)前面/in the front of在……(内部的)前面
take place发生/take the place(of)代替
at table进餐/at the table在桌子旁
by sea乘船/by the sea在海边
in future从今以后，将来/in the future未来
go to school(church…)上学(做礼拜…)/go to the school(church…)到学校(教堂…)去
on horseback骑着马/on the horseback在马背上
two of us我们当中的两人/the two of us我们两人(共计两人)
out of question毫无疑问/out of the question不可能的，办不到的
next year明年/the next year 第二年
a teacher and writer一位教师兼作家(一个人)/a teacher and a writer一位教师和一位作家(两个人)

数词
表示两倍时用twice，表示三倍以上的倍数时用times。如：
The earth is 49 times the size of the moon.
This desk is twice as large as that one.

算式表达法：
5+6：five plus six(or five and six)
7-6：seven minus six
2×3：two multiplied by three(or two times three)
8/4：eight divided by four

a+单数名词+or two做主语，谓语动词用单数形式。one or two+复数名词，谓语动词用复数形式。如：
A word or two is missed in the sentence.
One or two words are missed in the sentence.