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He was at dinner when I came. 

我來時他正在吃飯。

She stayed at work when everybody else had gone home. 

別人都回家了，她卻還在工作。

The country has been at war with its neighbour for three years. 

這個國家與鄰國交戰(zhàn)已有三年了。

at cards 在玩牌            

at work 在辦公 at play  在玩耍；在吃中飯    

at rest在休息        

at table在吃飯

at school在上學       

at church在做禮拜

at peace和平時期

at press正在排印

at one’smeals在吃飯

at one’s study在學習

at thepiano在彈鋼琴

at the end (of)在結束時

at the desk在讀書

He is inthe army.

他正在當兵。

He’s beenin politics all his life.

他一生從政。

Her husbandwas in business.

她丈夫是經(jīng)商的。

He lookstired. He is in need of a rest.

他看來很累了，需要休息一會兒。

in action在運轉

in progress在進行

inoperation在運行中

in thecourse of在……過程中

in the act of正在做……時

The typist is away onholiday this week.

打字員本周休假。

The man onwatch didn’t notice the danger.

值班的人沒有注意到這危險。

We have soarranged matters that one of us is always on duty.

我們做了這種安排，以便我們總有一個人值勤。

on guard在值勤

on leave在休假

on holiday在度假

on strike在罷工

on sale出售

on loan借貸

on the boil水正在開

on the move 在移動，搬遷，離開

on themarch在行軍

on the watch注意，提防

on the flow在漲潮

on the turn在轉折中

on theincrease正在增加

on the go正在活動，正在奔走

on the air正在廣播

on the fly正在飛行

Don’tworry. Everything is under control.

別擔心，一切都在控制之中。

That has norelation to the matter under discussion.

這和討論的問題沒有關系。

underdevelopment在發(fā)展中 

under observation在觀察中

undertest在被測試

under construction在建設中

under fire在炮火中        

under examination在檢查(調(diào)查)中

underconsideration在考慮中

under repair;在修理中