it would be nice. would是虚拟语气还是作为情态动词的用法?it would be nice. 是结合上下文的虚拟语气,还是情态动词?和it will be nice. 有什么区别?

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• it would be nice. would是虚拟语气还是作为情态动词的用法?
• 虚拟语气 表现在和将来,如何区分If I had time,I would go there.虚拟语气里面,与现在事实相反的虚拟,从句：If 主语+过去时(Be动词用were) 主句：主语+should/would/could/might+do：与将来事实相反的虚拟：从句：If 主语+过去时(Be动词用were) 主句：主语+should/would/could/might+do：现在事实,和将来 事实 的虚拟,这两种情况里面,有完全一样的,句子构成,如何区分?比如 If I had time,I would go there.从结构上看不出来,现在,或是 将来的 虚拟,是要 结合语境,和上下文区分么?还是别的方法.
• it would be nice. would是虚拟语气还是作为情态动词的用法?it would be nice. 是结合上下文的虚拟语气,还是情态动词?和it will be nice. 有什么区别?
• if引导的虚拟语气应该用什么时态?1.if引导的虚拟口气是不是只有两个时态,if+过去式,情态动词过去式+动词现在时 或 if+had+现在分词,情态动词过去式+have+动词分词 这两种句型?2.应该怎么使用他们这两种时态呢?我总分不清什么时候用过去式和什么时候用完成时,例如：if you were at home yesterday,i would come to see him还是 if you had been at home yesterday,i would have come to see him 应该是哪个呢?3.应该怎么分辨if是引导虚拟语气还是引导真实语气啊?
• 一项工程甲单独做需要20天完成,乙单独做需要30天完成,丙单独做需要40天完成,开始三人合作,后来甲另外有事离开,由乙和丙解决合作全部,工作共用了12天完成,问甲工作了几天?列方程
• We would have an agreement with your company.这句话中的would是虚拟语气吗?如果不是,那是情态动词吗?