正在进行"这一动作,通常用现在进行时表示。如:I am having a class now.我现在正在上课。但"正在进行"这一动作,还可以用"be+介词短语"来表示。

常见的介词短语有:be+at引导的介词短语;be+in引导的介词短语;be+on引导的介词短语;be+under引导的介词短语等。

　　I. be+at引导的介词短语

　　be at war正在交战

例如:

　　The two countries are at war now.

　　be at work正在工作

例如:

　　Jim is at work on his car now.

　　be at peace 处于和平或平静状态

例如:

　　Thus Europe was at peace for the first time in ten years.

　　be at table 正在吃饭

例如:

　　When I arrived, my friends were at table.

　　常见的这类结构还有:be at meeting 正在开会; be at school正在上学; be at breakfast (lunch/supper) 正在吃早(午/晚)饭; be at church正在做礼拜,等等。

　　II. be+in引导的介词短语

　　be in progress 正在进展

例如:

　　The building of the bridge is in progress.

　　be in trade正在做买卖

例如:

　　Some people of this country are in gold and ivory trade.

　　be in fashion 流行

例如:

　　Long hair is very much in fashion now.

　　be in trouble处于困境/困难之中

例如:

　　I am in great trouble. My little boy has fallen off a ladder and hurt himself.

　　常见的这类结构还有:be in danger 处于危险之中;be in operation正在运行;be in action在活动(运转/战斗)中;be in class 正在上课;be in hospital 正在住院; be in office在执政; be in tears 正在流泪,等等。

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