it is strange that sb should do与have done的区别意义与使用环境

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it is strange that sb should do与have done的区别意义与使用环境
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it is strange that sb should do与have done的区别意义与使用环境
it is strange that sb should do与have done的区别
意义与使用环境

it is strange that sb should do与have done的区别意义与使用环境
it is adj.+...+(should)+do 是一种虚拟语气的
而have done 是对已发生过的事情表示很strange

should do(表提出建议)还没有做某事 have done 在过去已完成了某事

就是句型it is strange that sb should do