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在英语中,由介词in、on、at等加某些不带冠词的名词所构成的介词短语可以表示正在呈现的状态或正在进行的动作,有的还可以表示被动意义.请看例句:1).They were at work when Icame in.=They were working when Icame in.2).The pictures are on show inthe large hall.=The pictures are being shownin the large hall.3).The thief is still in prison.=The thief is still being kept inprison.4).The machine is under repair.=The machine is being repaired.现将常见的此类情况归纳如下:
In English, prepositional phrases consisting of prepositions in, on, at, etc., plus some unarticulated nouns can represent the state being presented or the ongoing action, and some can also represent passive meaning. See the example sentences: 1).They were at work when Icame in.=They were working when Icame in.2).The pictures are on show in the large hall.=The pictures are being shownin the large hall.3).The thief is still in prison .=The thief is still being kept inprison.4).The machine is under repair.=The machine is being repaired. Now the common situation is summarized as follows: