时间介词at; in ;on 的用法
1. at
1中英在线互译时间的一点、时刻等..如：
工藤新一日语They came home atitem是什么 ven o’clock.
at night; at noon; at midnight; at ten o’clock; at daybreak; at dawn.
2后面接表示岁数的词..
Children in China start school at 6 years old.
3较短暂的一段时间..可指某个节日或被认为是一年中标志大事的日子..如：
He went home at Christmas at New Year; at the Spring Festival.
2. in
1在某个较长的时间如世纪、朝代、年、月、季节以及泛指的上午、下午或傍晚等内..如：
bazi in 2004; in March; in spring; in the morning; in the evening; etc
2 s是什么意思在一段时间之后;常用于将来时..
He will arrive in two hours.
The products will be produced in a month.
3. on
1具体的时日和一个特定的时间;如某日、某节日、星期几等..如：
On Christmas DayOn May 4th; there will be a celebration.
2在某个特定的早晨、下午或晚上..如：
He arrived at 10 o’clock on the night of the 5th.
很快英语3准时;按时..如：
If the train should be on time; I should reach home before dark.
表示频率的副词用法详解
一、常见的频率副词
always;usually;often;sometimes; ldom;never.
1 always表示的频率为100%;意思是"总是、一直、始终"..
I always do my cleaning on Sundays. 我总是在星期天搞卫生..
2usually与always相比;表示的频率要低些;约为70%-80%..意思是"通常"..
Plants are usually green. 植物通常是绿色的..
Usually she goes to work by bus. 她通常乘公共汽车去上班..
3often的频率比usually又略低些;约为60%-70%;意思是"经常"、"常常"..
Do you often write to them 你常给他们写信吗
Does Fred come here often 弗雷德常来这儿吗
4sometimes的频率比often又低些;约为50%＞sometimes＞30%;意思是“有 时、不时”..
Jenny usually eats a sandwich for lunch. Sometimes she eats soup.
5ldom 的频率比sometimes还要低些约为20%左右;意思是“很少”..
My father was ldom at home on Sundays. 我父亲星期天很少在家..
6never与always完全相反;是100%否定;意思是“从不;决不;总是不“..
I can never stop. 我绝不会停止..
Li Ming never wears dress. 李明从不穿裙子..
I would never do anything to hurt him. 我绝不会做任何伤害他的事情..
二、频率副词示意图
三、频率副词在句中的位置
通常频率副词放在行为动词之前; be动词;情态动词或助动词之后..但是sometimes最活跃..它既可以在句中也可以在句首;还能在句末..其它词如often 也可以放在句中也可以放在句末;这里就不一一列举了..
四、注意的问题
always的完全否定形式是never;部分否定形式是not always.例如：She always wears a dress. 她总穿裙子..改否定句
阿房宫赋翻译1She never wears a dress. 她从不穿裙子..彻底否定
2She does not always wear a dress. 她不总穿裙子..部分否定
有如：The rich are not always happy.富有未必是幸福的..
时间介词用法练习：
1. Children get gifts ____ Christmas and ____ their birthdays.
A. on; on B. at; on C. in; in D. in; on
2.----There is nothing ____tomorrow afternoon; is there
-----No. We can have a game of table tennis.
A. on B. in C. out D. up
3. A lot of students in our school were born____March; 1981.
A. in B. at C. on D. since
4. He suddenly returned____ a rainy night.
A. on B. at C. in D. during
5. My grandfather was born____Oct. 10; 1935.
A. on B. in C. at D. of
6. The train is starting___five minutes.
A. in B. at C. for D.still
7. Mike does his exercis ____ ven _____ the evening.
A. on; to B. at; in C. by; of D. at; on
8. Children wake up very early____the morning of Christmas Day.
A. in B. on C. for D. at
9 ____ a cold winter morning; I met her in the stfeet.
A. In B. On C. At D. For
10 It happened to be very cold____ the morning of our sports meeting.
A. at B. on C. with D. of
11. Why did you get up so early ___ this morning.
A. on B. / C. at D. in
12. He went to Shanghai___ September 3; 1991 and came back___ a cold morning last year.
A. in; on B. on; in C. on; on D. in; ia
13. Lucy was born____ the night of May 12; 1984. . ...
A. on 学术型和专业型 B. in C. at D. to
14. Mrs Brown came to China ____ 1996.
A.on B. of C. to; D. in
15 ___ the morning of November 20; 1915; the workers came to Chicago to show their mourning of Joe Hill.
A. On 正在初始化B. In C. On D. At
16. Ann moved___Hangzhou___September; 1992.
A. /; in B. to; in C. to; on D; in; in
17. They started off___an autumn afternoon.
A. during B. at C. in D. on
18. He often goes ____ school ____ six thirty ____ the morning.
A. for; to; in B. to; at; in C. to; for; at D; for; at; toappreciated
19. He arrived ___ Shanghai ___ 9: 30 ___ March 5.
