pleace they must have finished their work by now.为什么用have fi

wangkailai20002022-10-04 11:39:543条回答

pleace they must have finished their work by now.为什么用have finished?
they finally succeeded in carrying out the experiment.
they must have finished their work by now.为什么用have finished?
i have been looking forward to hearing from you.为什么用have been?
it has not been decided yet when the meeting will start at the hall.为什么用been,不要be?
i won't visit that restaurant today.won't 在什么时候用?

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今冬 共回答了23个问题 | 采纳率91.3%
1.通过后面的 BY NOW 我们可以了解到 主人翁肯定已经做过这件事 所以用MUST HAVE DONE 来说明非常确定 .翻译:他们现在肯定已经完成他们的工作了.
2.他们最终成功地完成了那项实验.
3.现在完成时 有一条 叫做 如果句子中的动作从现在开始并对以后有所影响 将需用现在完成时 这里就是 我很期待收到你的来信.即是这种情况.
4.这是毫无疑问的啊 前面用了has 后面如果再用BE 的话 一句话不就出了两个谓语了吗 而且 由翻译也可得出 这句话需用现在完成时 而现在完成时的基本结构不就是 something has (not ) been done
翻译:到底什么时候会议会在大厅开始到现在还没确定下来.
5.won't 是will not 的缩写形式 一般情况下 是用于一般将来时的 有时在虚拟语气中也可能会用到 要是情况而定了 .和WILL 用法一致 是WILL 的否定形式了 .
个人分析的 很辛苦 真心希望能帮到楼主
1年前
changjiu 共回答了4个问题 | 采纳率
1、他们最终实施出了那个实验。
2、by加一段时间“到`````为止”是完成时的标志:现在他们肯定完成了他们的工作,强调对现在造成的影响,因此用have finished.
3,、这里用的是完成时,“会议什么时候将会在大厅召开还没有决定”has been decided 是完成时的被动形式,be 只能是一般现在时的被动,因此不用。
4、“我不打算今天参观哪个旅馆”参观这个动...
1年前
fengjunbao 共回答了15个问题 | 采纳率86.7%
他们最后成功完成了实验。
因为后面有by now 完成时,可看语法关键词。
持续期待,现在完成进行时
前面是have 要加been
表将来某一时间。
1年前

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Pleace c__ your homework after you finish it.
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应该是check
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Wait until pleace once
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因为没有前后文,我猜是:再一次等待到达那个地方.或者:等待到达以前那个地方.
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