The past participle of the main verb the meaning is. This is the present perfect, which is constructed using: 接下来让我们看下what happen和what happened的用法区别： 1.词性：what happen是用原形动词happen构成的现在时短语，而what happened是用动词happen的过去式happened构成的过去时短语.
Here’s what Caitlin Clark said after being selected No. 1 in the WNBA
The helping verb have 2.
What happened 和 what's happened两者的区别： 是问 what happened？只是想知道过去所发生的事情， 而如果用what's happened？则强调对现在的影响。，即想知道过去所发生的什么事导致了说话时.
接下来让我们看下what happen和what happened的用法区别： 1.词性：what happen是用原形动词happen构成的现在时短语，而what happened是用动词happen的过去式happened构成的过. 表示“某地 (某时)发生了什么事”，常用“sth.+ happen +地点/时间”这一结构来表达，此时主语应是事情。例如： the story. What happened?和what's happening?的区别是什么？what happen?表示发生了什么，用于询问发生了什么事情，通常用于过去的事件或突发情况。而what’s happening?表示正在发生什么，用于 'happend' is a spelling mistake of happened.
