has是have的三单形式,而had则是have 的过去时.三单形式是什么

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• have的单三形式是?
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• have的单三形式是?
• have的三单形式是什么
• 虚拟语气if 大多数的虚拟条件句属于上面三种情况的一种,但并不排除存在条件和后果中,一个和现在情况相反,另一个和过去情况相反,例如：If you had followed what the doctor said,you would not have been so painful now例句该怎么详细分析 我觉得主从句都是过去时的虚拟语气啊?虚拟现在时表示与现在事实相反的假设，其if 从句的谓语形式用动词的过去式(be 一般用were)，主句用would/ should/ could/ might +动词原形you would not have been so painful now 是对现在的虚拟 那为什么要用have been 不应用be吗
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