表進(jìn)行意義的四類介詞短語
一、at+名詞
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。類似的還有：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(xué)?????? at church在做禮拜at peace和平時期at press正在排印有些結(jié)構(gòu)可能帶有冠詞或物主代詞：at one’smeals在吃飯&nb 10.5pt; mso-ascii-font-family: 'TimesNewsp;at one’s study在學(xué)習(xí)at thepiano在彈鋼琴at the end (of)在結(jié)束時at the desk在讀書

二、in+名詞
He is inthe army.他正在當(dāng)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。類似的還有：in action在運轉(zhuǎn)in progress在進(jìn)行inoperation在運行中有些結(jié)構(gòu)可能帶有冠詞：in thecourse of在……過程中in the act of正在做……時

三、on+名詞
Are youhere on business or for plea
你是來辦事還是來玩?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。類似的還有：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借貸有些結(jié)構(gòu)帶有冠詞：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(zhuǎn)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

四、under+名詞(名詞前有時有冠詞修飾)
Don’tworry. Everything is under control.別擔(dān)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(guān)系。類似的還有：underdevelopment在發(fā)展中 under observation在觀察中undertest在被測試 under construction在建設(shè)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