1.winter的意思是“冬,冬天,冬季”,多用作不可数名词,常不加冠词; 但具体表示某一年的冬天时可用作不可数名词, winter前要加定冠词the; 其前有定语修饰时,须加不定冠词。
2.泛指“在冬天”时须用介词in。
3.winter与one, this, last, next等词连用时其前一般不用介词,在句中多用作时间状语。
4.winter也可表示“年,岁”,为可数名词,常用于诗歌中。
5.winter and summer的意思是“不分寒暑”,在句中常用作状语,前面不加介词。

Commerce in the urban districts has been carried on smoothly since winter set in.自从冬季来临后,市区的商业一直在顺利开展着。
The snow indicates the coming of winter.这场雪显示冬天来临。
I took more exercises in winter than in summer.我在冬天锻炼得比在夏天多。
Dusk sets early in winter.冬季天黑得早。
One winter we went to Switzerland.一年冬天,我们去了瑞士。
Last winter we had a lot of snow.去年冬天,我们这里降雪很多。
We used 20 tons of coal last winter.去年冬天我们用了20吨煤。
The old peasant conjectured that it would be an unusually cold winter.那老汉推测冬天将会异常地寒冷。
The last few winters have been very cold.近几年冬天,天气一直很冷。
He is keen on winter sports.他对冬季体育运动非常感兴趣。
The student went to Vermont during his school's winter recess.寒假期间,那个学生赴佛蒙特州。
Once the winter ploughing is completed, it will be time to consider this question.冬耕一完就该考虑这个问题了。
Winter and summer the trees were always moving in the wind.不分寒暑,这些树总是在风中摇曳。
He has seen seventy winters.他已70岁了。
It happened many winters ago.那件事发生在许多年以前。

1.她冬天就回家来。
［误］  She'll be home by the winter.
［正］  She'll be home by winter.
［析］  表示季节的spring, summer, autumn和winter四个词,在泛指“春、夏、秋、冬”时,其前不加定冠词; 如要表示具体的某一个季节时,则通常在其前加上定冠词。
2.一年有四季：春、夏、秋、冬。
［误］  There are four seasons in the year: Spring,Summer,Autumn and Winter.
［正］  There are four seasons in the year: spring, summer, autumn and winter.
［析］  四季的名称一般不大写。

winter偶尔可用作动词,意思是“过冬,避寒”。例如:
We plan to winter in Italy.我们打算到意大利去过冬。
Robins winter in the south.知更鸟在南方越冬。