he looks so happyMay be he (---)he won the first prize

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he looks so happyMay be he (---)he won the first prize
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he looks so happyMay be he (---)he won the first prize
he looks so happyMay be he (---)he won the first prize

he looks so happyMay be he (---)he won the first prize
he looks so happy May be he (knows)he won the first prize
主一般现在,从句原是什么时态还用什么时态.
主过去,从句时态向后去.如主knew 从句为had known

He looks so happy. Maybe he knows he won the first prize.

knew
因为后面句子的时态用了won,所以用过去式knew