tell me what was (happened)at 10. what did you see

可以用happened吗

不可以, 因为happen 是不及物动词
was happened 是被动语态了, 不可以

用happening 构成过去进行时

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第1个回答  2013-05-22
Tell me what happened at 10:00 and what you saw. 口语中,what happened? 也是经常用的。你可以不用说 tell me 就是简单地问一下:
What happened at 10:00? What did you see?