（1）专用名词、物质名词、抽象名词、人名、地名等名词前面一般不加冠词
Knowledge is power.
We can't live without air.
China has a large population.
（2）表示头衔、职务的名词作表语、同位语、宾语补语、主语补语时不加冠词
Abraham Lincoln was elected president of the United States in 1860.
Wang Ping， monitor of Class Three， won the first prize.
但是，当这些名词作主语时，要加定冠词：
The president of USA will visit America in the near future.
He was elected__/__President for the third time. That was a great victory of his party.
Elizabeth II，__/_Queen of England， declared the conference open.
（3）称呼语前面不加冠词
Where are you going， mum？
Jimmy said that / Uncle hadn't come back and _/__Auntie was out.
The general ordered his men，"Use your knife， young man！"
（4）泛指复数名词前面不加冠词
We're Senior Three students.
——What are they？——They're workers.
（5）by+交通工具／通讯工具
A.——Do you know how he will come here？
——I think he'll come here by bus/train/taxi/ship/plane/bike.
B.I'll tell you by telephone/email.
但是使用其他介词时要注意：
He'll come in her taxi/on her bike/on a bus.
You're wanted on the telephone.（你有电话。）
（6）用在介词at／by后面，表示时间，不加冠词
at daybreak/dawn/dusk/noon/sunrise/sunset/night
B.Most people work by day and rest by night.（大多数人白天工作晚上休息。）
（7）在turn（变成，成为）后面的名词前面不加冠词
His son turned writer at last.=His son became a writer at last.
（8）几个词组
in space/in distance /peace/public by chance/accident/surprise
on foot/duty/earth out of breath/ reach/sight/control
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