the police would never be able to keep an eye on everyone..w

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/05/14 18:14:48

the police would never be able to keep an eye on everyone..would是什么用法,是助动词还是情态动词,
为什么不用will

此句为英语中的虚拟语气的用法,虚拟语气用来表示说话人的主观愿望或假想,而不表示客观存在的事实,所说的是一个条件,不一定是事实,或与事实相反.
有3种形式：
1、表示与现在事实相反的情况：
从句：If 主语+过去时(Be动词用were)
主句：主语+should/would/could/might+do：
2、表示与过去事实相反的情况
从句：If 主语+had+done
主句：主语+should/would/could/might+have done　
3、表示对将来情况的主观推测
从句：①if+主语+were to do
②if+主语+should/would/could/might+do
③if+主语+did（动词过去式）/were
主句：主语+should/would/could/might+do　
要点在这里了,具体句子具体分析吧
再问：这个是对将来情况的主观推测吗？，would换成could 也可以吧？虚拟语气不是条件句也可以吗
再答：是对现在的推测，那几个情态动词是不能随便换的，要根据句意，因为could-can有“能够”的意思隐藏在里面，以此类推

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