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时间介词(at, in ,on) 的用法1. at （1）时间的一点、时刻等。如： They came home at seven oclock. (at night, at noon, at midnight, at ten oclock, 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： in 2004, in March, in spring, in the morning, in the evening, etc （2） 在一段时间之后,常用于将来时。 He will arrive in two hours. These 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 Day（On 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 oclock on the night of the 5th. （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， seldom，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。2）usually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。 3）often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？ 4）sometimes的频率比often又低些，约为50%sometimes30%，意思是“有 时、不时”。 Jenny usually eats a sandwich for lunch. Sometimes she eats soup.5）seldom 的频率比sometimes还要低些约为20%左右，意思是“很少”。 My father was seldom at home on Sundays. 我父亲星期天很少在家。6）never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 dresses. 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alwaysneverusuallyoftensometimesseldom0三、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)1）She never wears a dress. 她从不穿裙子。(彻底否定)2）She 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 exercises _ seven _ 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 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 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; to ( ) 19. He arrived _ Shanghai _ 9: 30 _ March 5. A. at; in; at B. to; on; at C. in; on; at D. in; at; on ( ) 20.The English teacher told me to get there_ half past ten. A: in B. at C. on D. of
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