what happened or what happen ?

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https://englishwithnab.com/what-did-happen-or-what-happened-which-one-is-correct

https://englishwithnab.com/what-did-happen-or-what-happened-which-one-is-correct
What did happen? OR What happened? – Which one is correct
The short practical answer:— Use did when we knew something had happened but wanted more details. In other words, treat did as an emphatic to express some kind or level of surprise, shock, disbelief, doubt or need for confirmation. It’s like, if that didn’t happen, what actually happened? The short technical answer:

https://english.stackexchange.com/questions/340530/what-happen-or-what-happened

https://english.stackexchange.com/questions/340530/what-happen-or-what-happened
grammar – What happen or what happened – English Language & Usage Stack …
2 Answers Sorted by: 2 What happened? is correct here. If your question refers to the whole sentence

https://grammarhow.com / what-happen-or-what-happened

https://grammarhow.com / what-happen-or-what-happened
What Happen or What Happened – Which Is Correct? – Grammarhow
What Happen or What Happened – Which Is Correct? The correct phrase is what happened. It is grammatically wrong to say what happen. When you want to ask about an event or an occurrence that happened in the past, you say, what happened. The phrase what happened is a complete question.

https://strategiesforparents.com/what-happen-or-what-happened-understanding-grammar-and-usage

https://strategiesforparents.com/what-happen-or-what-happened-understanding-grammar-and-usage
What Happen or What Happened: Understanding Grammar and Usage
What Happen or What Happened: Understanding Grammar and Usage By: Susan Parker Published: March 27, 2021 Happen is a regular, much-used verb that most English students will discover early in their language journey. It is an active, intransitive verb, and knowing how to use it in all its tenses is important for fluency.

https://dictionary.cambridge.org/grammar/british-grammar/happen

https://dictionary.cambridge.org/grammar/british-grammar/happen
Happen – Grammar – Cambridge Dictionary
from English Grammar Today Happen means ‘occur’ and most commonly ‘occur by chance’: What will happen if it rains? Will someone tell me what’s happened? A: You haven’t been out in ages. When did you last go to the cinema? B: It just happened that we went to see that new film last night.

https://dictionary.cambridge.org/us/dictionary/english/happen

https://dictionary.cambridge.org/us/dictionary/english/happen
HAPPEN | definition in the Cambridge English Dictionary
(of a situation or an event) to have existence or come into existence: No one knows exactly what happened but several people have been hurt. Anything could happen in the next half hour. A funny thing happened in the office today. I don’t want to think about what might have happened if he’d been driving any faster. to someone/something A2

https://dictionary.cambridge.org/dictionary/english/happened

https://dictionary.cambridge.org/dictionary/english/happened
HAPPENED | English meaning – Cambridge Dictionary
(of a situation or an event) to have existence or come into existence: No one knows exactly what happened but several people have been hurt. Anything could happen in the next half hour. A funny thing happened in the office today. I don’t want to think about what might have happened if he’d been driving any faster. to someone A2

https://www.merriam-webster.com/dictionary/happened

https://www.merriam-webster.com/dictionary/happened
Happened Definition & Meaning – Merriam-Webster
hap· pen ˈha-pən -pᵊm happened; happening ˈhap-niŋ ˈha-pə- Synonyms of happen intransitive verb 1 : to occur by chance often used with it it so happens I’m going your way 2 : to come into being or occur as an event, process, or result mistakes will happen 3 : to do, encounter, or attain something by or as if by chance I to know the answer 4

https://dictionary.cambridge.org/us/dictionary/english/happened

https://dictionary.cambridge.org/us/dictionary/english/happened
HAPPENED | definition in the Cambridge English Dictionary
(of a situation or an event) to have existence or come into existence: No one knows exactly what happened but several people have been hurt. Anything could happen in the next half hour. A funny thing happened in the office today. I don’t want to think about what might have happened if he’d been driving any faster. to someone A2

https://www.wordreference.com/englishusage/happen

https://www.wordreference.com/englishusage/happen
happen – WordReference.com English Usage
Happen does not have a passive form. Don’t say, for example, ‘ Then a strange thing was happened ‘. ‘take place’, ‘occur’. Happen is usually used after vague words like something, thing, what, or this. After words with a more precise meaning, you usually use take place or occur. The incident had taken place many years ago. lesoutrali bot