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Questions & Answers about ¿Qué te pasa, hijo?
Why does ¿Qué te pasa? mean "What's wrong?" when pasar usually means "to pass" or "to happen"?
Is te the subject of the verb pasa here?
No, the subject is actually Qué (What). The verb pasa is conjugated in the "he/she/it" form to match "what". The pronoun te is an indirect object, showing who this unknown thing is happening to.
Why can't I just say ¿Qué es mal? to mean "What's wrong?"?