You would use what happened? to refer to an event in the past happened็็จๆณhappened็็จๆณๅฆไธ๏ผ1.happenedๆฏไธๅ็ฉๅจ่ฏ,ไฝโๅ็โ่งฃๆถ,ๅฏๆๅถ็ถ็ไบๆ ,ไนๅฏๆๆ่ฎกๅๆๆ ่ฎกๅๅ็็ไบใไธ่ฌไปฅไบไปถใ็ฏๅขใๅฝขๅฟ็ญไฝไธป่ฏญ,่กจ็คบโๆไบบๅ็ๆไบโๆถ,. What's happened? refers to an event in the recent past which has an effect on the present
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The story happened in 2003.่ฟไธชๆ ไบๅ็ๅจ2003ๅนด. An accident happened in that street.้ฃๆก่กไธๅ็ไบไธ่ตทไบๆ . 2.่กจ็คบโๆไบบๅบไบๆไบ(ๅธธๆไธๅฅฝ็ไบ)โ,่ฆ็จโsth.+ happen+to sb.โ่ฟไธ็ปๆๆฅ่กจ. The story happened in 2003.่ฟไธชๆ ไบๅ็ๅจ2003ๅนด. An accident happened in that street.้ฃๆก่กไธๅ็ไบไธ่ตทไบๆ . 2.่กจ็คบโๆไบบๅบไบๆไบ(ๅธธๆไธๅฅฝ็ไบ)โ,่ฆ็จโsth.+ happen+to sb.โ่ฟไธ็ปๆ. what happened๏ผ่ฏๆงไธบ็ญ่ฏญ๏ผwhat happenedๆฏไธไธช็ญ่ฏญ๏ผ็ฑ้ๅฎ่ฏwhatใๅจ่ฏhappen็่ฟๅปๅผhappened็ปๆ๏ผ็จไบ่ฏข้ฎ่ฟๅปๅ็็ไบๆ ใ ้่ฟไธ้ข็่กจๆ ผๆไปฌไบ่งฃไธwhat happenๅwhat.
"What happened"ๆฏไธไธช่ฟๅปๆถๆ็็ฎๅ่ฟๅปๅผ๏ผ่"What's happened"ๆฏไธไธช็ฐๅจๅฎๆๆถๆ็็ผฉๅๅฝขๅผใ 1. ้ไนๅบๅซ๏ผ - "What happened"่กจ็คบๅฏนๅทฒ็ปๅ็็ไบๆ ่ฟ่ก่ฏข้ฎ๏ผๅผบ่ฐ่ฟๅป็ไบไปถๆ.
happened็็จๆณhappened็็จๆณๅฆไธ๏ผ1.happenedๆฏไธๅ็ฉๅจ่ฏ,ไฝโๅ็โ่งฃๆถ,ๅฏๆๅถ็ถ็ไบๆ ,ไนๅฏๆๆ่ฎกๅๆๆ ่ฎกๅๅ็็ไบใไธ่ฌไปฅไบไปถใ็ฏๅขใๅฝขๅฟ็ญไฝไธป่ฏญ,่กจ็คบโๆไบบๅ็ๆไบโๆถ,้กปไปฅ. ใWhat happened๏ผใๆไธบใๅ็ไบไปไน๏ผใ๏ผ่ฏข้ฎ่ฟๅปๅ็็ไบๆ ๆไบไปถใ ใWhat's happening๏ผใๅฏไปฅ็ฟป่ฏไธบใๆญฃๅจๅ็ไปไน๏ผใ๏ผ่ฏข้ฎๅฝๅๆญฃๅจ่ฟ่ก็ไบๆ ๆไบไปถใ ไพๅฅ๏ผ. What happened to you? is common and accepted What has happened to you? is cool, too
It happened that he had to take part in a meeting that afternoon.็ขฐๅทง้ฃๅคฉไธๅไปไธๅพไธๅๅ ไธไธชไผ่ฎฎ. ๆณจ๏ผthatไปๅฅไธญ็ไธป่ฏญๆฏไบบๆถ,ๆญค็ง็ปๆๅฏไปฅไธโsb.+ happen + to do sth.โ็ปๆไบๆข.ไพๅฆ๏ผ It. 3ใhappened๏ผhappenไนๅฏๅฆbe่ฌ็จไบๅญๅจๅฅไธญ๏ผๅ ถๆถๆ้กปไธๅ ถๅ็ไธป่ฏญไฟๆไธ่ด๏ผhappenๆฏ็ฌ้ดๅจ่ฏ๏ผไธ่ฝไธ่กจ็คบไธๆฎตๆถ้ด็็ถ่ฏญ่ฟ็จ๏ผไนไธ่ฝ็จไบ่ฟ่กไฝใ ไธใไพง้็นไธๅ. 1.
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