什么时候用in on at

什么时候用in on at

at,in ,on,和by 表示时间的区别：
at指时间表示：
1）时间的一点,一时刻：
They come home at surprise (at noon,at midnight,at ten o’clock,at daybreak,at dawn).
2) 较短的一段时间.可指某个节日或认为一年中标志大事的日子.
His grandfather died at seventy-two.
At the beginning (middle,end) of that month he was sick.
He went home at Christmas (at New Year,at the spring Festival,at night,at midsummer).
In指时间表示：
1）在某个较长的时间（如世纪,朝代,年,月,季节,及泛指的上午,下午和晚上等）内.
He died in the holidays.
He was born in 1942.
2) 在一段时间之后.
He will come round in a day or two.
I will finish it in three hours.
On指时间表示：
1）具体的时日和一个特定的时间,如某日,某节日,星期几等.
He will come to meet us on our arrival.
On May 4th (On Sunday,On New Year’s day,On Christmas Day),there will be a celebration.
2) 在某个特定的早晨,下午或晚上.
He arrived at 10 o’clock on the night of the 5th.
He died on the eve of victory.
3) 准时,按时.
If the rain should be on time,I should reach home before dark.
In 表示比较大的地方,2)虽然是很小的地方,如果说话人住在那里,也可用in.商店,机关,学校等,若看作一个地点（point)用at,若看作一个场所（place)用in.
I met him at the post-office.
I’m now working in the post-office.
On表示地点,一般指与面或线接触：
1）“在…上面”
He put the book on the table and sat on the chair.
The picture was hanging on the wall.
2) “在…… 旁边”
New work is on the Hudson River.
Xiamen is on the river.
He lives in a house on the river.
1).near,by,beside,at表示“在•••••••附近”的区别：
near 表示相对的“近”,实际距离可能还很远.例如：
There is a post office near our school.
Suzhou is near Shanghai.
By和beside都表示“靠近”,实际距离不可能很远,但beside比by更具体的表示出“在•••••••旁边”的意思.
例如：
There is a big tree by the river.
He was sitting beside her.
by还可以表示“尺寸,距离”.例如：
They escaped death by inches.
Do you see the hole high up in the wall,about 18 cm by.

介词in,on与at都可用于表示时间的名词前，但用法各不相同，其区别在于：
一、用in的场合
（1）表示“在某年/月/季节”这个含义时，须用介词in。例如：
She came to this city in 1980.他于1980年来到这个城市。
It often rains here in summer.夏天这里常常下雨。
（2）表示“从现在起一段时间以后”时，须用介词in。例如：
They will go to see you in a week.他们将在一周后去看望你。
I will be back in a month.我将在一个月后回来。
（3）表示“在某世纪”时，须用介词in.例如:
This machine was invented in the eighteenth century.这台机器是在18世纪发明的.
Great changes took place in the twentieth century.20世纪发生了巨大变化.
（4）表示“在某年代或特定世纪某年代”时，须用介词in。例如：
This incident happened in the 1970''''s.该事件发生在20世纪70年代。
The Anti-Japanese War broke out in the 1930''''s.抗日战争爆发于20世纪30年代。
除此之外，morning / evening / afternoon 三个词也常跟介词in连用。例如：
Don't watch TV too much in the evening.晚上看电视不要太多。
They sometimes play games in the afternoon.他们有时在下午做游戏。
二、用on的场合
（1）表示“在具体的某一天”或“（在具体的某一天的）早上、中午、晚上”等，须用介词on。例如：
Jack was born on May 10th,1982.杰克生于1982年5月10日。
They left on a rainy morning.他们是在一个雨天的早上离开的。
He went back to America on a summer afternoon.他于一个夏天的下午返回了美国。
（2）表示“在星期几”或“在星期几的早上、中午、晚上”等，须用介词on。例如：
We don't go to school on Saturday and Sunday.我们星期六和星期天不上学。
What time do you get up on weekdays?你在平日什么时候起床？
I heard this story on Saturday morning.我是在星期六的早晨听到这个故事的。
（3）表示“在某一节日”时，须用介词on。例如：
We usually eat mooncakes on Mid-autumn Festival.我们通常在中秋节吃月饼。
Mr Hu received a card on Teachers''''Day.胡老师在教师节那天收到了一张卡片。
注意：当morning,evening,afternoon被of短语修饰，习惯上用in,而不用on.例如：
in the early morning of September 10th 在9月10的清晨；
in the late afternoon of September 12th 在9月12日的傍晚。
三、用at的场合
（1）表示“某一具体时刻（即几点几分时）”，须用介词at。例如：
He gets up at six o''''clock every day .他每天六点起床。
I got home at five thirty yesterday afternoon.我昨天下午五点半到家。
（2）用在特定的时候（时节、时机）时，须用介词at。例如：
They were happy at that time.他们那时很幸福。
I think the shop is clcsed at this time of day.我认为商店在白天的这个时候关门了。
（3）表示“在中午、在夜晚、在周末”时，须用介词at。例如：
What do you often do at noon?你中午经常做些什么？
You can see many stars in the sky at night.夜晚你能看到天空中有许多星星。
（4）表示“在……岁”时，须用介词at。例如：
At the age of nine ,the boy could swim well.在九岁的时候，这孩子就游泳游得很好了。
At the age of twenty,I began to teach English at this school.在二十岁的时候，我就开始在这所学校教英语了。
注意：在含有next ,last,this,one ,any, each, every , some, all的词组和tomorrow,yesterday, the day after tomorrow, the day before yesterday 前不用任何介词。例如：
What did you do last summer holidays?去年暑假你做了些什么？
What are you going to do the day after tomorrow?后天你打算做什么?
这是百度的。。

at, in , on, 和by 表示时间的区别：
at指时间表示：
1）时间的一点，一时刻：
They come home at surprise (at noon, at midnight, at ten o’clock, at daybreak, at dawn).
2) 较短的一段时间。可指某个节日或认为一年中标志大事的日子。
His grandfather died at seventy-two.
At the beginning (middle, end) of that month he was sick.
He went home at Christmas (at New Year, at the spring Festival, at night, at midsummer).
In指时间表示：
1）在某个较长的时间（如世纪，朝代，年，月，季节，及泛指的上午，下午和晚上等）内。
He died in the holidays.
He was born in 1942.
2) 在一段时间之后。
He will come round in a day or two.
I will finish it in three hours.
On指时间表示：
1）具体的时日和一个特定的时间，如某日，某节日，星期几等。
He will come to meet us on our arrival.
On May 4th (On Sunday, On New Year’s day, On Christmas Day), there will be a celebration.
2) 在某个特定的早晨，下午或晚上。
He arrived at 10 o’clock on the night of the 5th.
He died on the eve of victory.
3) 准时，按时。
If the rain should be on time, I should reach home before dark.
In 表示比较大的地方，2)虽然是很小的地方，如果说话人住在那里，也可用in.商店，机关，学校等，若看作一个地点（point)用at,若看作一个场所（place)用in.
I met him at the post-office.
I’m now working in the post-office.
On表示地点，一般指与面或线接触：
1）“在…上面”
He put the book on the table and sat on the chair.
The picture was hanging on the wall.
2) “在…… 旁边”
New work is on the Hudson River.
Xiamen is on the river.
He lives in a house on the river.
1). near, by, beside, at表示“在•••••••附近”的区别：
near 表示相对的“近”，实际距离可能还很远。例如：
There is a post office near our school.
Suzhou is near Shanghai.
By和beside都表示“靠近”，实际距离不可能很远，但beside比by更具体的表示出“在•••••••旁边”的意思。
例如：
There is a big tree by the river.
He was sitting beside her.
by还可以表示“尺寸，距离”。例如：
They escaped death by inches.
Do you see the hole high up in the wall, about 18 cm by 9?
希望可以帮到你
追问：你别复制好吗更后悔
追答：自己笨不知道搜搜看？给你费工夫发就不错了，你看看谁还给你发来。。。切~