一、what happened發生什麼事了；發生了什麼事；怎麼了
例句：
1.He did not give any importance to what happened to himself.
他從來不把自己的安危看得那樣重。
2.He decided to do all he could to produce a still higher vacuum and find out whathappened then.
他決心盡一切力量造成更高的真空度，看看會有什麼景象發生。
3."Don't talk like a fool, " I said. "Besides, what happened to me is supposed to be funny. I never think about it. "
“別說傻話了，”我說。“而且，對我自己的遭遇，我總是一笑置之，我從來不去想它。”
二、what is going on怎麼回事；發生了什麼事；怎麼一回事
1.What is going on with you that you feel so happy to be around your kids?
什麼會使你覺得孩子在你周圍很幸福？
2.By objectifying his thoughts in the medium of language, he gets a chance to seewhat is going on in his mind.
通過語言來表達思想，他看到了自己頭腦中發生的一切。
3.The flipside of his benign attitude to staff is his determination to know what isgoing on at the company at all times.
在他對待員工態度溫和的另一面，是他對公司狀況了如指掌的決心
一、what happened發生什麼事了；發生了什麼事；怎麼了
例句：
1.He did not give any importance to what happened to himself.
他從來不把自己的安危看得那樣重。
2.He decided to do all he could to produce a still higher vacuum and find out whathappened then.
他決心盡一切力量造成更高的真空度，看看會有什麼景象發生。
3."Don't talk like a fool, " I said. "Besides, what happened to me is supposed to be funny. I never think about it. "
“別說傻話了，”我說。“而且，對我自己的遭遇，我總是一笑置之，我從來不去想它。”
二、what is going on怎麼回事；發生了什麼事；怎麼一回事
例句：
1.What is going on with you that you feel so happy to be around your kids?
什麼會使你覺得孩子在你周圍很幸福？
2.By objectifying his thoughts in the medium of language, he gets a chance to seewhat is going on in his mind.
通過語言來表達思想，他看到了自己頭腦中發生的一切。
3.The flipside of his benign attitude to staff is his determination to know what isgoing on at the company at all times.
在他對待員工態度溫和的另一面，是他對公司狀況了如指掌的決心