也是一样的) am/is-was-been are-were-been (been为be/am/is/are的过去分词) speak-spoke-spoken(没有加en的说法,是部分不规则动词的过去分词有ed结尾的) 动词的过去式用于一般过去时, 动词的过去分词用于完成时,如现在完成时,就用have/has+动词的过去分词 如过去完成时,就用had+动词的过去分词 想对你...
要看具体句子啊.一般来说,did因为已经表示过去时态了,在句子中做助动词,后面加动词原形,如 I did my homework yesterday.(我昨天做了作业.) 而been是be的完成时,一般与have been连用.如果这个been作助动词,那么后面加动词的分词形式,可以是I have been doing homework the whole morning.(我已经做作业做了一早...
④特殊疑问句：特殊疑问词+一般疑问句（have/has+主语+过去分词+其他）+?⑤被动语态：现在完成时的被动语态的肯定式为：have/ has +been +done。如：The experiment has been done successfully. 这个实验做得很成功。现在完成时的被动语态的否定式为：have/ has +not +been +done。如：Tom’s novel has not...
must have been后面可以加过去分词和现在分词。must have been done对过去的推测,被动形式,一定被……This village must have been hit by hurricane, for we saw the ruined houses and the fallen trees all over the places.这个村子一定是遭受了龙卷风的袭击,我们看到到处都是被破坏的房屋和被吹倒的树木。
解析 视情况而定.it has been a long time since a serious war occurred in the western world. it has been a long time since the technology has motivated us to make things. 谓语为过去式的多表示已经过去的,为过去分词的多表示还在持续进行的对现在还是如此的状态.一般中学考试多考虑为第一种....
要看具体句子啊。一般来说，did因为已经表示过去时态了，在句子中做助动词，后面加动词原形，如 I did my homework yesterday.(我昨天做了作业。)而been是be的完成时，一般与have been连用。如果这个been作助动词，那么后面加动词的分词形式，可以是I have been doing homework the whole morning.(我...
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视情况而定。it has been a long time since a serious war occurred in the western world.it has been a long time since the technology has motivated us to make things.谓语为过去式的多表示已经过去的，为过去分词的多表示还在持续进行的对现在还是如此的状态。一般中学考试多考虑为第一种。
视情况而定.it has been a long time since a serious war occurred in the western world.it has been a long time since the technology has motivated us to make things.谓语为过去式的多表示已经过去的,为过去分词的多表示还在持续进行的对现在还是如此的状态.一般中学考试多考虑为第一种.