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hAs BEEn hAD BEEn

区别:一、 has been是现在完成时.had been是过去完成时.(1)he has been worked in hospital 表示他过去在医院工作,现在有可能还在医院工作 (2)单数或第三人称时用has they have been worked in hospital (3)人称复指,第一二人称时用

用法区别如下: 1、had been过去完成时; 2、has been现在完成时. 3、have been 和 has been 只是根据前面主语的人称而定,都是一般现在完成时 简单来说如果前面是I,you,we以及复数形式的主语则是have been.第3人称单数如he,she,it

has/have done是现在完成时,与过去时的区别是结果对现在所造成的影响,has/have been done是现在完成时的被动语态,had done是过去完成时,动作发生在过去的过去,had been done是过去完成时的被动语态,

过去完成时用had,have则用于现在完成时.

have been 是现完 主语复数或是主格 has been 是现完 主语三单 had been 过完

has been 是现在完成时 had been 是 过去完成时 动作完成的时间不同

1)have +过去分词,构成完成时态,例如: He has left for London. 他已去了伦敦. By the end of last month, they had finished half of their work. 上月未为止,他们已经完成工作的一半. 2)have + been +现在分词,构成完成进行时,例如: I

意思没有太大却别,就是时态的不同,have been和has been是现在完成时态,但是它们有人称和数的差别,had been是过去完成时态,没有人称的变化,

have been 主语是复数;has been 主语是第三人称单数;had been 时态是过去完成时

have been 和has been是现在完成时 表示做过这件事 已经完成区别是:如果主语是第三人称She,He,It,就用has,除此之外,用have比如说i have been to shanghai 意思是我已经去过上海了had been 是过去完成时 即过去完成过什么动作 做过这件事i had been a good student 我过去曾经是一个好学生had been也可用在虚拟语气中 表示假设 比如说if i could go to school, i had been a good student如果我过去可以上学的话 我会是个好学生 表示虚拟语气时 had been可以 用were来代替

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