... Past Continuous 过去进行时 Present Perfect Simple 现在完成时 Present Perfect Continuous 现在完成进行时 ...
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present perfect and past simple 现在完成时和过去简单
Simple Present Perfect Tense 现在完成时
Past Simple vs Present Perfect 一般过去时和现在完成时
The present perfect simple is often used to talk about past actions and events which are completely finished.
一般现在完成时经常用于谈论过去的行为和事件其完全结束。
At first glance it looks as if there is no element of "present involvement" in this use of the present perfect any more than in the simple past.
乍看起来，在现在完成时的用法中，似乎跟在一般过去时中一样，都没有“涉及现在”的因素。
Comparison Compare the difference between the simple past tense and the present perfect tense.
现在完成 时与一般过去时所表示的动作或状态都发生在过去，区别…
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