一、and连接两个相同的名词主要表示两个意思：
1.是表示“许多”。如：
I’ve known her for years and years.
我认识她好多年了。
They had worked together for months and months.
他们一起工作了好几个月。
We saw flowers and flowers and flowers on the hill.
我们看到满山遍野的鲜花。（nd连接三个及其以上相同的复数名词，表示数量之多，到处都是。）
There are people and people and people in the streets on holidays.
假日街上到处都是人。（nd连接三个及其以上相同的复数名词，表示数量之多，到处都是。）
They talked for hours and hours. 他们谈了很长很长时间。
The road went on for miles and miles. 这条路很长很长。
2.是强调差别，意为“与……不同（不一样，有差别）”。如：
Don’t worry—there are rules and rules. 别担心——规则跟规则不一样。
I like city life but there are cities and cities. 我喜欢城市生活，但城市之间也有差别。
There are books and books.
书有种种，好坏不一。
There is meat and meat.
肉有优劣。
3. and可以表强调：
The people and the people alone，are the motive force in the making of history.
人民，只有人民，才是创造历史的动力。
另外. 当由and连接的两个并列主语前面有each，every， no修饰时，谓语动词用单数形式。
Every boy and (every) girl likes the puppy. 每个男孩女孩都喜欢这只小狗。
No desk and (no) chair was seen in the room. 房间里不见桌椅。
二、and连接两个相同的动词主要表示反复或连续、接连
He tried and tried but without success.
他反复尝试，但没有成功。
The baby laughed and laughed. 这个婴儿笑呀，笑个不停。
He coughed and coughed. 他咳个不停。
两次使用and连接相同的动词，表示强调连续或更加重复：
He talked and talked and talked.
他谈了又谈。
三、and连接两个相同的形容词或副词的比较级主要表示：越来越
The pain got worse and worse.
疼痛越来越厉害了。
Learning becomes more and more difficult as we get older.
随着年龄增长，学习变得越来越难。
She looked at me and cried harder and harder.
她看着我，哭得越来越厉害。
The weather is getting colder and colder. 天气越来越冷了。Your English is getting better and better. 你的英语越来越好了。
She found the job less and less attractive. 她发觉那工作越来越缺乏吸引力。He played the piano less and less as he grew older. 他随着年龄的增长,弹钢琴的次数越来越少了。There seems to be less and less time between each birthday and the next. 年年过生日,间隔的时间好像越来越短了。
四、and连接两个相同的数词主要表示加；加上
5 and 5 makes 10.
5加5等于10。
五、 当连接两个相同的副词时,以下两种用法值得注意: (1) 表示动作的反复或连续,如on and on,over and over,again and again等。 He kept moaning on and on. 他呻吟不已。
They talked on and on very happily. 他们很高兴地谈了又谈。
He knocked at the door again and again: there was no answer. 他一再敲门,但无人应答。 The car skidded off the road and rolled over and over down the slope. 汽车滑出路面,打着滚翻下坡去了。 (2) 有时构成习语,有其特定的意思,如by and by(不久,马上)、through and through(完全,彻底)等。 They’ll be arriving by and by. 他们马上就要到达。
My mother is Irish through and through. 我母亲是地地道道的爱尔兰人。
