虚拟语气中的条件从句条件从句中,能不能用到have+过去分词?比如说,可不可以说If You have told me,

虚拟语气在时态上必须突出一般过去时和过去完成时。虚拟语气往往指的是不可能做或完成的事情。例如：
1 Mary talks / talked to her brother as if / as though she WERE his mother ------ 指的是现在或者将来。（强调状态方面）
2 He told us about the Mars as if / as though he had been there himself --------- 指的是过去的事情。 （强调动作方面）

you're welcome indeed