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You would use what happened? to refer to an event in the past 3ăhappenedïŒhappenäčćŻćŠbeèŹçšäșććšć„äžïŒć ¶æ¶æéĄ»äžć ¶ćçäž»èŻäżæäžèŽïŒhappenæŻçŹéŽćšèŻïŒäžèœäžèĄšç€șäžæź”æ¶éŽçç¶èŻèżçšïŒäčäžèœçšäșèżèĄäœă äžă䟧éçčäžć. 1. What's happened? refers to an event in the recent past which has an effect on the present
Max Verstappen, Red Bull left stunned by 'shocking' Singapore GP
The story happened in 2003.èżäžȘæ äșćçćš2003ćčŽ. An accident happened in that street.éŁæĄèĄäžćçäșäžè”·äșæ . 2.èĄšç€șâæäșșćșäșæäș(ćžžæäžć„œçäș)â,èŠçšâsth.+ happen+to sb.âèżäžç»ææ„èĄšèŸŸ.äŸ. ăWhat happenedïŒăæäžșăćçäșä»äčïŒăïŒèŻąéźèżć»ćççäșæ æäșä»¶ă ăWhat's happeningïŒăćŻä»„çż»èŻäžșăæŁćšćçä»äčïŒăïŒèŻąéźćœćæŁćšèżèĄçäșæ æäșä»¶ă äŸć„ïŒ. what happenedïŒèŻæ§äžșçèŻïŒwhat happenedæŻäžäžȘçèŻïŒç±éćźèŻwhatăćšèŻhappençèżć»ćŒhappenedç»æïŒçšäșèŻąéźèżć»ćççäșæ ă éèżäžéąçèĄšæ Œæä»Źäșè§Łäžwhat happenćwhat.
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It happened that he had to take part in a meeting that afternoon.çą°ć·§éŁć€©äžćä»äžćŸäžćć äžäžȘäŒèźź. æłšïŒthatä»ć„äžçäž»èŻæŻäșșæ¶,æ€ç§ç»æćŻä»„äžâsb.+ happen + to do sth.âç»æäșæą.äŸćŠïŒ It. 3ăhappenedïŒhappenäčćŻćŠbeèŹçšäșććšć„äžïŒć ¶æ¶æéĄ»äžć ¶ćçäž»èŻäżæäžèŽïŒhappenæŻçŹéŽćšèŻïŒäžèœäžèĄšç€șäžæź”æ¶éŽçç¶èŻèżçšïŒäčäžèœçšäșèżèĄäœă äžă䟧éçčäžć. 1ăhappenïŒçšäșäžèŹ. The story happened in 2003.èżäžȘæ äșćçćš2003ćčŽ. An accident happened in that street.éŁæĄèĄäžćçäșäžè”·äșæ . 2.èĄšç€șâæäșșćșäșæäș(ćžžæäžć„œçäș)â,èŠçšâsth.+ happen+to sb.âèżäžç»æ. "What happened"æŻäžäžȘèżć»æ¶æççźćèżć»ćŒïŒè"What's happened"æŻäžäžȘç°ćšćźææ¶æç猩ććœąćŒă 1. éäčćșć«ïŒ - "What happened"èĄšç€șćŻčć·Čç»ćççäșæ èżèĄèŻąéźïŒćŒșè°èżć»çäșä»¶æ.
HappenedççšæłhappenedççšæłćŠäžïŒ1.happenedæŻäžćç©ćšèŻ,äœâćçâè§Łæ¶,ćŻæć¶ç¶çäșæ ,äčćŻææèźĄćææ èźĄććççäșăäžèŹä»„äșä»¶ăçŻćąăćœąćżçäœäž»èŻ,èĄšç€șâæäșșćçæäșâæ¶,.