Ⅲ.be+on引导的介词短语
be on strike(正在罢工):The electricity workers have been on strike for several weeks now.电力工人到目前已经罢工好几个星期了。(即现在仍在罢工)
be on leave(正在休假):Several soldiers are on leave in our village.几位军人正在我们村子里休假。
be on the rise(正在上涨):Prices of vegetables are on the rise.蔬菜价格正在上涨。
常见的这类结构还有:be on a visit正在访问;be on the stumps处在困难之中;be on sale正在出售(美语作:削价出售),等等。
Ⅰ.be+at引导的介词短语
be at war(正在交战):The two countries are at war now.两国正在交战。
(相当于:The two countries are waging a war now.)
be at work(正在工作):Jim is at work on his car now.吉姆正在修自己的车。
(相当于:Jim is repairing his car now.)
be at peace(处于和平或平静状态):
Thus Europe was at peace for the first time in ten years.
于是欧洲在十年以后第一次进入和平状态。
be at table(正在吃饭):When I arrived my friends were already at table.
当我到达时,我的朋友们正在吃饭。
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。
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