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be是原形,可以做助动词,后面一般接doing结构,表示现在进行时,或者接done结构,表示被动语态。 如,He is working.他正在工作。 这里的is就是be动词。 He is asked to answer the question.他被要求回答问题。 注意,在不同的时态中be有不同...

一般是区别have been to 和have gone to。 前者是表示去过某地已经回来,比如-Where did you go during this holiday? -I have been to Beijing. 后者则表示去过还没回来,比如-Where is your Dad? -He has gone to Beijing.望采纳!

你所说的应该是have been to与have gone to的区别吧? have been to"到过(某地),去过(某地)“, 表示之前到过某地,强调说话的当时去某地的人已返回或在说话的现场,通常会和次数连用。例如: I have been to Beijing Twice.我到过北京两次...

)have+been +过去分词,构成完成式被动语态,例如: English has been taught in China for many years.(中国教英语已经多年。) 2)现在完成进行时构成:have / has been + 现在分词 用法:)下面详细举例:)~ 用于表示动作从过去某一时间开始一...

have/has been+done 是现在完成时表被动,has been的主语是第三人称单数,have的主语不是第三人称单数。简单来说如果前面是I,you,we以及复数形式的主语则用have been ,第三人称单数如he,she,it,则是用has been 。 拓展 一、现在完成时态由"have...

一、现在完成时,构成:have/has+been+过去分词 Has the sports meet been put off until next Friday? 运动会已经推迟到下周五了吗? 二、过去完成时,构成:had+been+过去分词 The fire had been put off when the firefighters arrived. 消防...

have been doing 网络 现在完成进行时; 现在完成进行时态; 完成进行时态; 现在完成进行; 将来完成进行时 Biological systems have been doing this for billions of years. 生物系统亿万年来一直都是这样。 had been doing 网络 过去完成进行时;...

可以的 我特意帮你查了些资料,希望对你有用! 助动词have的用法 1)have+been +过去分词,构成完成式被动语态,例如: English has been taught in China for many years.(中国教英语已经多年。) 2)现在完成进行时构成:have / has been + 现在...

短暂性动词不可以和一段时间连用,所以当一些短暂性动词和一段时间连用时,要把短暂性动词转化成延续性动词或状态。像arrive ,come,go 等往往改为be+介词at/in ;leave 往往改为be away (from...) stop, end, finish往往改为be over;begin/start ...

had been done 表示过去的过去,是过去完成的被动态时。(当你想说发生在过去的两件事时,就要分清谁先谁后。先发生的用过去完成时,后发生的要用过去时)。 如:The rooms had been cleaned when I came. 我来的时候,房间已经被打扫了。 have/...

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