what happened or what happen ?

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grammar – What happen or what happened – English Language …
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They have different tempus, but what happened (imperfect) is correct while what happen (presens) isn’t. The reason what happen is incorrect is that the subject is 3rd person singular which requires an s on the verb. Correct presens form would be what happens.

https://learnenglishwithdemi.wordpress.com/2015/05/26/what-happened-or-what-did-happen/

What happened? or What did happen? – Learn English with Demi

What happened? or What did happen?

What happened (to my father)? This is a subject question because what (the question word) is the subject of the verb happened. The subject questions don’t take auxiliary verbs . Below are subject questions. The verb and its subject are bolded and italicized. The speaker is expecting the answer to be the subject of the sentence:

https://www.proz.com/kudoz/english/general-conversation-greetings-letters/3719572-what-happen-or-what-happened.html

What happen or what happened? | English | General …
https://www.proz.com/kudoz/english/general-conversation-greetings-letters/3719572-what-happen-or-what-happened.html
what happened. Explanation: The past tense, ‘happened’ is correct. ————————————————–. Note added at 2 hrs (2010-02-26 08:47:43 GMT) ————————————————–. In the context offered, you are asking what (events) happened that changed or effected Jen.

https://forum.wordreference.com/threads/is-what-happens-or-what-happen.391502/

is what happens or what happen? | WordReference Forums
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What happen ? Is correct if WHAT is referred to many things, plural. So in the present tense they don’t need to write verbs in plural form. Eg. What are they? What happen? What happened ? is correct . Past tense. What’s happened?(what has happened?) is correct . Present perfect tense. What is happening ? is correct. Present continuous tense. What will happen ? Future tense.

https://www.quora.com/Which-one-is-correct-What-did-happen-or-What-happened?share=1

Which one is correct, ‘What did happen?’ or ‘What happened …
https://www.quora.com/Which-one-is-correct-What-did-happen-or-What-happened?share=1
You used happened, which is the past tense and past participle of to happen. The correct phrasing would be When did it happen? Below are examples of how to use the auxiliary verb do with happen in the past and present tenses. (Note: You cannot use do with the future; it should be When will it happen?).

https://www.englishforums.com/English/HappenedHappen/qbmrn/post.htm

What Happened Or What Did Happen?
https://www.englishforums.com/English/HappenedHappen/qbmrn/post.htm
instead of What did happen? I have asked this question in Y Q and they said What happened is the correct one.

https://www.usingenglish.com/forum/threads/31088-What-happened-vs-What-s-happened

What happened vs. What’s happened – UsingEnglish.com
https://www.usingenglish.com/forum/threads/31088-What-happened-vs-What-s-happened
You would use What happened? to refer to an event in the past; What’s happened? refers to an event in the recent past which has an effect on the present. For example: I was expelled from school in 1998. Why? What happened? (Peter drops a tray of cups and saucers. Mary hears the noise from another room) Mary: What’s happened?

https://ell.stackexchange.com/questions/112462/what-happened-what-had-happened-or-what-has-happened

past tense – What happened? What had happened? or What has …
https://ell.stackexchange.com/questions/112462/what-happened-what-had-happened-or-what-has-happened
What had happened is the past tense of what has happened. It means something has started in the past and ended in the past. Has happened means something started in the past and just ended now. happened is simple past indicates a specific time or moment in the past. When you use an adverbial, such as yesterday, last month, or in 1967 …

https://www.irishtimes.com/life-and-style/health-family/when-or-will-life-ever-go-back-to-normal-1.4502199

BBC Learning English | Ask about English
www.bbc.co.uk/worldservice/learningenglish/grammar/ask_about_english/080610/
They happened nothing. The first two are correct, of course. This means that we are asking a question about the subject of the sentence, so to make the correct question, we use the verb in the…

https://ell.stackexchange.com/questions/141009/what-is-happening-or-what-happens-in-this-sentence

present tense – What is happening or what happens in this …
https://ell.stackexchange.com/questions/141009/what-is-happening-or-what-happens-in-this-sentence
2 Answers2. Active Oldest Votes. 1. When people say things like We’ll see what happens or We’ll see what he does or We’ll see how they respond, the context is usually some decision which has just been reached or some plan of action—or inaction!—to be initiated in the immediate future; and the see is less about watching future consequences as they …