what happened to him yesterday.为什么要用happened?happen可以吗

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whathappenedtohimyesterday.为什么要用happened?happen可以吗whathappenedtohimyesterday.为什么要用happened?happen可以吗

what happened to him yesterday.为什么要用happened?happen可以吗
what happened to him yesterday.为什么要用happened?happen可以吗

what happened to him yesterday.为什么要用happened?happen可以吗
不可以用happen,因为yesterday已经说明是昨天发生的,要用过去式