have是什么时态的标志由刀豆文库小编整理，希望给你工作、学习、生活带来方便”。
现在完成时是英文时态的一种。
现在完成时的用法：
主语+have(has)+过去分词(done)；
现在完成时用来表示现在之前已发生过或完成的动作或状态,但其结果却和现在有联系,也就是说,动作或状态发生在过去但它的影响现在还存在。
扩展资料
现在完成时可以用来表示发生在过去某一时刻的`,持续到现在的情况,常与for,since连用.
Mary has been ill for three days.
I have lived here since 1998.
现在完成时往往同表示不确定的过去时间状语连用,如already, yet, just, before, recently,still, lately等:
He has already obtained a scholarship.
I havent seen much of him recently (lately).
We have seen that film before.
Have they found the missing child yet
