帮忙看下这个虚拟语气的句子The teacher asked them who had completed their tests to leave the room as quietly as possible.这个句子中的ask,我翻译成“要求”,那么为什么who 后面用完成时?（1）这里的ask 是“问”

I have advised her when the bags will arrive.这个句子后面为什么用will arrive 而不是arrive（虚拟语气我是在看虚拟语气语法讲解的时候看到的,不理解,麻烦大家帮忙讲解一下!不胜感激! 帮忙看下这个虚拟语气的句子The teacher asked them who had completed their tests to leave the room as quietly as possible.这个句子中的ask,我翻译成“要求”,那么为什么who 后面用完成时?（1）这里的ask 是“问” 虚拟语气中的情态动词帮忙解决下would,should,could,might等在虚拟语气句子中的区别. I would have answered your letter earlier,but there just wasn't time.看下这个句子是虚拟语气吗?该怎么理解,最好和我讲下虚拟的情况,本人很混淆 这个句子是用的虚拟语气么?As if she find out that you've lost her books这个句子是正确的么?如果是这句是虚拟语气么?请说明下句子结构 这个句子是虚拟语气吗?If operated by computers in the future,many trains will have no drivers.如果是的话为什么不符合一般虚拟语气的标准呢?为什么不是many trains would have drivers呢? The plant is dead.I( )more water 应填shoulu have given 为什么是虚拟语气这个句子是不是虚拟语气另外讲一下省略if倒装 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,We’d have had to come home before the term was out anyway.” 虚拟语气的反意疑问句虚拟语气的句子改成反义疑问句,有哪些规则? 谁知道英语中虚拟语气的用法?怎样判断句子是否用虚拟语气? 请教suggest的虚拟语气的用法,什么情况下是虚拟语气 She demanded that I pay her immediately她要求我立即付款给她这个句子是陈述语气?祈使语气?虚拟语气?为什么?请简略点,我的陈道真语法书说他是虚拟语气, 请帮我看下这个英文句子可以不可以这样改成虚拟语气~there is a chance for me to start over,perhaps i`ll choose the same way.i didn`t regret in any way for all these things i`ve done.改成 there were a chance for me to start over 虚拟语气的 虚拟语气的用法 英语语法的虚拟语气 虚拟语气的用法 虚拟语气的知识