[介词]
(1)表示事情发生的地点或场合: I'll drop you at the station. They met at a conference.
(2)表示事情发生的时间: The train leaves at 6.00. Will you be home at lunchtime?
语法结构
1 at | + 名词短语
At one end of the beach there is a restaurant.
We have just landed at Gatwick Airport where the local time is 11.25.
I left my wallet at home.
The Prime Minister lives at 10 Downing Street.
Let's meet at the cinema.
谈论空间和旅途中的某个地点、住址或从事某些活动的地方。
The meeting finished at 9.00.
The trains stop running at midnight.
I only ever see my family at Christmas.
Dad retired at 65, and took up gardening..
谈论钟点，或一天、一年或一生里的某个时间点
2 动词 | + at | + 名词短语
Look at the moon!
Don't shout at the dog: it can't understand you.
The children waved at the train as it passed.
I pointed at my glass and the waiter refilled it.
将注意力、声音或手势指向某人或某物。
3 形容词 | + at | + 名词短语
Isobel is good at maths.
At school I was terrible at sports.
表示擅长或不擅长做某事.
搭配
跟at搭配表示地点或场合的常用短语有:
at the beginning,at the end,at the top,at the bottom;
at home,at work,at school,at university等;
at Stuart's(place),at Lorna's等;
at the doctor's,at the hairdresser's,at the drycleaner's等;
at the bank,at the station,at the post office等;
at a party,at a meeting,at a concert,at a wedding等;
at breakfast,at lunch,at dinner。
经常跟at搭配表示时间的词有：dawn,sunrise,sunset,noon,night,midnight,the weekend.
经常跟at搭配(语法结构2)的动词是: look,stare,smile,laugh,get和be aimed。
Don't stare at the nuns.It's rude.
Can you get at the jar on the top shelf? I'm not tall enough.
I don't understand you. What are you getting at?
The publicity is aimed at teenagers.
固定短语
at (long ) last = eventually 最终
At long last the food arrived,but we were too tired to enjoy it.
at once= immediately,or,at the same time 立刻;同时
Serve it at once,while it is still hot.
You shouldn't try and do so many things at once.
at least ...至少，起码
There were at least a hundred people at the funeral.
If you do nothing else,you could at least tidy your room.
表示事物的最小数量或事情可完成的最低限度。
at the moment/at present=now 现在
I'm sorry,I'm rather busy at the moment.Can you call back?
at its/his/her etc. best= in its/his/her etc. best state 在它/他/她等的最佳状态
I'm sorry,I'm not at my best before breakfast.
'while you're at it' 顺便
I'm going to get some bread.~ Can you get some croissants while you're at it?
要求别人在做某事的同时做另一件事.
at all