could not have done

could not have done 1should not have done 2 could not have done 3 would not have done 有什么区别 请问could not have done/might not have done可用于虚拟语气中吗 May not have done 是表示可能不还是不可能 那Could not have done呢 情态动词加上完成时的意思?could not have done must not have done should not have done would not have done 以及它们的用法? could never have done can have done could have done should have done should to do shouldn't have done shouldn't to do还有needn't have doneneedn't domustn't have donemay not have donemight not have done Could have done would have done should have done could have been done ,could have could never have done和could not do有什么区别 could never have done 造句 how could you have done 英文句子 I could not have done this without you为什么要+have?和I could not done this without you有什分别? would have done,might have done,could have done,should have done分别表示什么意思? should have done ,shouldn't have done.could have done,couldn't have done could have done和need have could have done和would have done的区别 should have done和could have done的区别?