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

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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
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

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