They had been around for centuries.这是什么时态,帮忙分析一下句子结构,

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/18 17:03:08

这是过去完成时的主系表结构的陈述句.其中 They 是主语,had been 是系动词的过去完成形式,around 是表语,for centuries 是介词短语做状语.句子意思是：“截止到过去的某个时间点,它们已经在我们周边存在了数百年之久.”

They had been around for centuries.这是什么时态,帮忙分析一下句子结构, 请帮忙看以下句子是什么时态,有没有虚拟语气?帮我分析一下句子结构,时态, 请分析句子的时态People had been drinking white the willow bark for t 分析一下这句 being done是什么时态还有句子结构帮忙分析一下句子结构, 关于时态,麻烦分析一下句子结构请分析下面英语句子结构及时态：The dream he had had for so many years ended 帮忙划分一下句子成分,顺便分析一下句子The dream he had had for so many years en had been doing是什么时态 had been doing 是什么时态? 请大家帮忙分析一下这句话的句子结构请帮忙分析一下这几个句子语法结构、句子成分.