在所有的标点符号中，逗号 (comma) ','使用率最高，用法也最复杂。
1） 逗号用于并列句
逗号可用以分隔由并列连词连接的两个或两个以上的独立分句。常用的并列连词有 and，
The petrol planes were delayed by a heavy rain, and they barely had enough fuel to get
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在所有的标点符号中，逗号 (comma) ','使用率最高，用法也最复杂。
1） 逗号用于并列句
逗号可用以分隔由并列连词连接的两个或两个以上的独立分句。常用的并列连词有 and，
The petrol planes were delayed by a heavy rain, and they barely had enough fuel to get
back to
The bell rang on and on, and George was still reluctant to get out of bed.
She saw me in the street yesterday, but she did not recognise me.
You'd better apologise, or she'll not speak to you again.
如果相连的两个句子较短，可以不用逗号：
The wind was blowing and the water was cold.
John was busy cooking but Mary was playing the piano.
2）逗号用于并列的词或者词组
逗号还可用来分隔三个或三个以上并列的词或词组。我们知道，两个并列的词或词组一般 用and 或
After dinner , they talked, laughed, and sang.
The professor entered the classroom, opened his note-book, and began his lecture.
He is honest, courageous, and experienced.
有时甚至可以不用连词，全用逗号 例如
The hall was bright with coloured lanterns, red , green , yellow.
3）逗号用于前置状语
状语分句前置，一般要用逗号与主句隔开。例如：
As soon as he finished studying , he left the library.
When he returned from abroad , home was not what it used to be.
前置的状语如果不是分句而是词组，是否用逗号，视状语的长短而定。一般说来，状语较长宜用逗号，状语较短可不用逗号。例如：
In spite of their good intentions, most parents do not really understand their children.
He made his promise only yesterday, but today he changed his mind.
后置状语一般不须用逗号与主句隔开。例如：
You'll fail again unless you work hard.
I have been teaching English ever since my graduation.
4)
限制性关系分句与被修饰的先行项关系密切，连成一体，其前通常不用逗号。而非限制性关系分句大都仅起补充说明作用，所以多用逗号隔开。试比较下列两组句子。每组的前一句带限制性关系分句，后一句带非限制性关系分句：
I have a cousin who serves in the army.
He is my cousin , who serves in the army.
She went back to the city where she was born.
She went back to New York, where she was born.
-in 分词分句和
The house built by my grandfather faced the mountains. 这房子的修建者是我祖父，面朝群山。
My house, built by my grandfather, faced the mountains.
A person running for President needs to have a lot of money.
Henry Smith, running for the state governor, was in financial troubles.
5) 逗号用干直接引语
在直接引语前和引述分句后，汉语用冒号，而英语多用逗号。例如：
She said, 'I'll bring a pot of strong steaming hot coffee to the table.'
Jane said angrily, 'Bob, can't you be quiet for a moment?' Bob shouted back, 'Oh, dear, you're
6) 逗号用千日期、地点等表达法
逗号还可用于日期、地址等的表示法。
(1) 日期
He left London on May 15, 1985.
The
(2) 地址
Please send my mail to 55 People's Road, Nanshi District, Shanghai.
He gave 39 West 46th Street, Olean , New York as his new address.
The bell rang on and on, and George was still reluctant to get out of bed.
She saw me in the street yesterday, but she did not recognise me.
You'd better apologise, or she'll not speak to you again.
如果相连的两个句子较短，可以不用逗号：
The wind was blowing and the water was cold.
John was busy cooking but Mary was playing the piano.
2）逗号用于并列的词或者词组
逗号还可用来分隔三个或三个以上并列的词或词组。我们知道，两个并列的词或词组一般 用and 或
After dinner , they talked, laughed, and sang.
The professor entered the classroom, opened his note-book, and began his lecture.
He is honest, courageous, and experienced.
有时甚至可以不用连词，全用逗号 例如
The hall was bright with coloured lanterns, red , green , yellow.
3）逗号用于前置状语
状语分句前置，一般要用逗号与主句隔开。例如：
As soon as he finished studying , he left the library.
When he returned from abroad , home was not what it used to be.
前置的状语如果不是分句而是词组，是否用逗号，视状语的长短而定。一般说来，状语较长宜用逗号，状语较短可不用逗号。例如：
In spite of their good intentions, most parents do not really understand their children.
He made his promise only yesterday, but today he changed his mind.
后置状语一般不须用逗号与主句隔开。例如：
You'll fail again unless you work hard.
I have been teaching English ever since my graduation.
4)
限制性关系分句与被修饰的先行项关系密切，连成一体，其前通常不用逗号。而非限制性关系分句大都仅起补充说明作用，所以多用逗号隔开。试比较下列两组句子。每组的前一句带限制性关系分句，后一句带非限制性关系分句：
I have a cousin who serves in the army.
He is my cousin , who serves in the army.
She went back to the city where she was born.
She went back to New York, where she was born.
-in 分词分句和
The house built by my grandfather faced the mountains. 这房子的修建者是我祖父，面朝群山。
My house, built by my grandfather, faced the mountains.
A person running for President needs to have a lot of money.
Henry Smith, running for the state governor, was in financial troubles.
5) 逗号用干直接引语
在直接引语前和引述分句后，汉语用冒号，而英语多用逗号。例如：
She said, 'I'll bring a pot of strong steaming hot coffee to the table.'
Jane said angrily, 'Bob, can't you be quiet for a moment?' Bob shouted back, 'Oh, dear, you're
6) 逗号用千日期、地点等表达法
逗号还可用于日期、地址等的表示法。
(1) 日期
He left London on May 15, 1985.
The
(2) 地址
Please send my mail to 55 People's Road, Nanshi District, Shanghai.
He gave 39 West 46th Street, Olean , New York as his new address.