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对于具有现在结果的过去动作,或没有具体时间的经历,使用现在完成时(have/has + 过去分词)。表示经历用"ever/never",表示最近完成用"just/already/yet"。
I have saw that film.
I have seen that film. — 用过去分词(seen),不用一般过去式(saw)。
I have finished it yesterday.
I finished it yesterday. — 不要在"yesterday"这样具体的过去时间状语中使用现在完成时;用一般过去时。
hasn't finished
Have, visited