哪位高人能举个有情态动词can和be动词原形的疑问句吗

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• 哪位高人能举个有情态动词can和be动词原形的疑问句吗
• 哪位高人能举个有情态动词can和be动词原形的疑问句吗
• 情态动词can't have done 和couldn't have done 有什么区别吗对过去发生的事情否定猜测用can't have done 或couldn't have done ,两者有区别吗?比如 He can’t have gone to Beijing for I saw him a minute ago. 能换成He couldn’t have gone to Beijing for I saw him a minute ago.吗?谢谢
• 虚拟语气的省略问题,help~虚拟语气,若主从句主语一致,且谓语部分包含有动词be,通常可将主语和动词be省略：If it had been repaired earlier,the tractor would not have broken down.=If repaired earlier,the tractor would not have broken down.可是虚拟语气里,有时候又可以把if去掉,例如：If he were a man of sense,he wouldn’t say such a thing.= A man of sense wouldn’t say such a thing.问：有时候有if,有时候又没有,怎么理解呢?
• would like sb to do sth还是would like sb do sth