点击时间介词 at, on,in的用法
安徽巢湖 ● 万小泉
at，on和in是表示时间的常用介词，各类考试屡见踪影。初学者要想准确地使用，属实不易。Don’t worry！本文将帮你跨过此道难关。
一、选用介词at的场合
1．用于钟点前。如：at ten o’clock, at a quarterto six
2．用于时刻前。如：atnoon/night/midnight(半夜), atsunrise(日出时), atdusk(黄昏), at dawn/daybreak(黎明)
We will leave at daybreak.我们将在黎明时动身。
3．用于表示进餐时间。如：atbreakfast/lunch/supper(在早餐时/午餐时/晚餐时)
He drinks tea at breakfast.他在早餐时饮茶。
4．用于表示年龄时。如：at 14 (=at the age of14在14岁)
He left home at the age of16.他十六岁离开了家。
5．用于一些固定短语或习惯搭配中。如：at Christmas, at New Year, atThanksgiving(感恩节), at the Spring Festival, atmidsummer(仲夏), at the beginning/end oflast month, at the moment/ at that time, at this time ofday, at a bad time of year, at first(起初), atlast(终于)
二、选用介词on的场合
1．用于星期、日期(包括该天的各部分)前。如：on Sundays/weekdays, on Monday morning /afternoon / evening
I"m flying home on Sundayafternoon.我星期四下午乘飞机回家。
【温馨提示】“在周末”既可以说at weekends，也可以说on weekends。如：
I often go fishing on/ at weekends.我经常在周末去钓鱼。
2．用于morning/afternoon/evening/night/day前，此时这类名词前多有修饰语或带有of等引起的后置修饰语，指具体的或不具体的某一日。如：on a cold afternoon, on thenight of October 1, 1997, on the first day, on his birthday, onFriday afternoon, on the eve of victory(胜利前夕)
The story happed on the night of October25,1980.故事发生在1980年10月25日深夜。
3．用于公共节假日前。如：on Teachers’Day，on ChristmasDay/Eve，on National Day
【温馨提示】at，on都可用来表示“节假日”，但at侧重指“休假的时节”，而不是指具体的哪一天；on侧重指具体的时日，与它连用的短语中多含“Day”。试比较：
at New Year(在新年期间)at Christmas (在圣诞节期间)
on New Year’s Day(在元旦那天)on Christmas Day (在圣诞节)
三、选用介词in的场合
1．用于泛指一天的上午、下午、傍晚等。如：inthe morning/afternoon/evening/night
2．用于某个较长的时间，像世纪、朝代、年、月、季节等。如：in March, in spring, in 1997,in the twenty-first century(在二十一世纪), in one’sfifties(在某人50多岁时)
3．用于表示“从现在起，多久以后或多长时间内”的短语之前。如：
She’ll seeme again in a week’stime.一周后她再来看我。
I can drawa beautiful horse infive minutes.我可以在五分钟内画好一匹好看的马。
There are seven days ina week.一周有七天。
四、省略介词的情况
1．next，last，this，that与时间名词连用作状语时，该短语前常省略介词。如：
We’re going to work on a farm next Sunday.下个星期天，我们要去农场劳动。
They visited the Great Wall last year.去年他们参观了长城。
2．在today, tomorrow, yesterday,the day before yesterday, the day after tomorrow, tomorrownight等之前不用介词。如：
Are you free tomorrow night?明晚你有空吗?
Where did you go the day before yesterday?前天你去哪儿了?
上述用法你能记住吗？不妨试试下面口诀：
时间介词三兄弟,in on at分清记：
年月周前要用in,日子前面却不用；
遇到几号要用on,上午下午又是in；
要说某日上下午,用on换in才能行;
子夜黄昏用at,黎明用它也不错;
at用于时分前,兄仨各有习惯配;
灵活运用是关键,不得生搬和硬套。
【跟踪练习】
I. 选用at、in、on填空，不需要的请填“/”。
1. Maryusually reads English ________ night.
2. Maryoften reads English ________ the night.
3. Maryleft school ________ the night of May 4.
4. Maryleft home ________ a rainy night.
5. Marywill go to see a film ________ tomorrow night.
6. Aterrible earthquake happened in Wenchuan _________ May,.
7.Where were you _________ that time yesterday?
8. Theengineer will return from Macao _________ a few days.
9. _________ At Christmas, we have a bigparty.
10. What did you do_________ the day beforeyesterday?
II.选择最佳答案。
1. --When does your mothergo shopping?
--Usually ________Sunday mornings.
A.onB. inC. atD. for
2.--When did Hong Kong return to our motherland? -- ________ July7th, 1997.
A.OnB. InC. AtD. For
3. Ginawas born _________ 1999. She is old enough to go toschool.
A.toB. onC. atD. in
4._________ the morning of March 31, she made an important decisionin her life.
A.SinceB. InC. FromD. On
5. TheBrowns often come over to my family _________ theevening.
A.withB. inC. forD. of
6.Families like to get together ________ Mid-autumn Day.
A.onB. ofC. inD. with
7. Wehave four classes ________ the morning and then have a rest________ noon.
A. in;inB. in; atC. on; atD. at; in
8._________ the age of thirty, Peter went to Australia to look for ajob.
A. OnB. AtC.FromD. By
9. Theaccident happened _________ a cold winter morning.
A. inB. onC. atD. of
10. --When do you usuallyget up every day? --_________ about 6:00 a.m.
A.AtB. On C.InD. For
【本文发表于《英语大课堂》七年级版 No. 9】
