what happened

Explanation:
The past tense, ‘happened’ is correct.

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Note added at 2 hrs (2010-02-26 08:47:43 GMT)
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In the context offered, you are asking what (events) happened that changed or effected Jen. She responds “I had a bad day”. ‘Had’ is not the present. In her response she alludes to events that have already occurred that have made her look/seem upset, and have contributed to her having a bad day.

The following URLs offers some good examples of proper usage for the word ‘happen’. (dictionary references) They may help to shed some light on this for you.

http://www.merriam-webster.com/dictionary/happen
http://dictionary.reference.com/browse/happen

The same conversation, stated differently, would work with the usage of ‘happen’. Example:

“You look upset, Jen, did something happen? [did a change of some sort occur?]

“I had a terrible day.”

“What happen”? is incomplete. It is, however used in slang omitting the ‘ed’. It is not proper English, as David has done a good job explaining.

If you browse some of the the millions of hits on the net, and search through them, you may find many things. Most search engines pick up the ‘search’ word in any form. This helps people who are not native speakers to get where they may want to go.

Many sites I viewed where ‘what happen’ was used were entered by people who do not understand the many ways in which the word ‘happen’ can be used properly. I work with English language learners, who often adopt or confuse slang and seemingly become comfortable with this type of usage. This sort of usage is common slang: “What up”? “What happen?” What down”? I could go on and on, but the bottom line is that though you can use ‘happen’ many different ways, asking the question “What happen”? is always and forever incorrect. It’s confusing, to be sure.

In the following URL (one of those million hits) is an excellent example of a key word being picked up by a search, yet the writer has very poor English language skills in many ways. Because the statement exists on the internet does not make it correct.

The ‘search’ function grabs any word and offers a million different possibilities, but does not affirm that the exact word or phrase used in the search is correct.

I very often see ‘happen’ used incorrectly when editing Chinese>English. That is a very easy mistake to make, due to the complexities of the English language.

I hope this helps a bit.

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Note added at 2 hrs (2010-02-26 08:50:26 GMT)
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http://www.ehelp.com/questions/10436338/what-happen-to-the-a…

The past tense, ‘happened ‘ is correct. — — — — — — — — — — — — — — — — — — — — — — — — — bill added at 2 hour ( 2010-02-26 08:47:43 GMT ) — — — — — — — — — — — — — — — — — — — — — — — — — In the context offered, you are asking what ( events ) happened that changed or effected Jen. She responds “ I had a bad day ”. ‘Had ‘ is not the deliver. In her reception she alludes to events that have already occurred that have made her look/seem disorder, and have contributed to her having a bad day.The following URLs offers some good examples of proper custom for the son ‘happen ‘. ( dictionary references ) They may help to shed some light on this for you.The like conversation, stated differently, would work with the use of ‘happen ‘. Example : ” You look upset, Jen, did something happen ? [ did a exchange of some sort occur ? ] ” I had a atrocious sidereal day. “ “ What happen ” ? is incomplete. It is, however used in slang omitting the ‘ed ‘. It is not proper English, as David has done a good job explaining.If you browse some of the the millions of hits on the net, and search through them, you may find many things. Most search engines pick up the ‘search ‘ discussion in any form. This helps people who are not native speakers to get where they may want to go.Many sites I viewed where ‘what happen ‘ was used were entered by people who do not understand the many ways in which the word ‘happen ‘ can be used properly. I work with English terminology learners, who often adopt or confuse slang and apparently become comfortable with this type of custom. This screen of use is common gull : “ What up ” ? “ What happen ? ” What down ” ? I could go on and on, but the bottom note is that though you can use ‘happen ‘ many unlike ways, asking the wonder “ What happen ” ? is always and constantly incorrect. It ‘s confusing, to be sure.In the following URL ( one of those million hits ) is an excellent model of a key give voice being picked up by a search, yet the writer has identical poor english terminology skills in many ways. Because the statement exists on the internet does not make it correct.The ‘search ‘ function grabs any news and offers a million different possibilities, but does not affirm that the exact word or phrase used in the search is correct.I identical frequently see ‘happen ‘ used falsely when editing Chinese > English. That is a very easy error to make, ascribable to the complexities of the English language.I hope this helps a bit. — — — — — — — — — — — — — — — — — — — — — — — — — note added at 2 hour ( 2010-02-26 08:50:26 GMT ) — — — — — — — — — — — — — — — — — — — — — — — — —

what happen or what happened ?

Demi Ebrite
United States
Local time: 08:12

Native speaker of:
PRO pts in category:
United StatesLocal time : native speaker of : Native in English EnglishPRO pts in class : 36