Hello,
what happened ? ---- matha hasal? --- ماذا حصل؟ -- (or) matha hadath*? --- ماذا حدث؟
what's wrong? ----- ma al-khatb? ---- ما الخطب؟
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/note/ : [th*] =[th of "think"] --- the other "the" pronounce as "th" of the word father.
Salam.