Please be careful when you ______ the crowded street.这里是否只能填 cross?可不可以填 are crossing?如果不行,为什么呢?cross是短暂动词吗?
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Please be careful when you ______ the crowded street.
这里是否只能填 cross?
可不可以填 are crossing?如果不行,为什么呢?cross是短暂动词吗?
1.当然也可以填are crossing.具体该填哪个完全根据上下文的含义来理解.如果句子强调进行的意味,填are crossing完全可以.而如果表明"总该是如此"的话,cross就更加合适.
2.cross从意思上就能判断它是个延续性动词.
3.更正楼上的说法,when引导的时间从句的动词并没有所谓瞬间/延续的限定,该从句同样也可以用进行时态.它是比较灵活的.
如:He entered the classroom when I was reading books.
4.当然while引导的时间状语从句一定要求其谓语动词是延续性动词,且用进行时居多.
每当过马路的时候都要小心,不是正在进行时,是一般现在时
应该填cross
when一般引导一次性动词,不用延续时态。而如果要填are crossing
的话,从句前的引导词就应该换成while了,因为while专门引导进行时态。
是时态不对,这里是祈使句 应该用一般现在时
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