为什么是not have done和hadn't done ?

为什么是not have done和hadn't done ? can not have done sth和be considered to have done sth和offer t have not done 和 not have done 区别在哪? 请问shouldn't have done和might not have done 在此题中的区别? 请问:hadn't done 和hasn't done 和has to do 有什么不同? 区别shouldn't have done 和 needn't have done should have done 和should not have done的区别 can not done sth 和shouldn not have done sth 和might have done I wish I hadn‘t done or had done differently. I wish I hadn’t done could not have done 5.Not until darkness fell____he hadn't done half of his work