grown up 에대해서 고수님들 갈켜주세요

[클로이쌤]

보통 have(has) grown up 을 쓰잖아요.

you have grown up so much !  너 많이 자랐구나

he has grown up . 그는 다 컸다.

그런데, 질문-what did young Edison become when he was grown up? 

           답변-Young Edison became an inventor when he was grown up.

위에 was grown up  은 왜 수동태죠?

고수님들의 답변 기다릴게요.

[nick1]

~when he grew up.이 맞습니다. grow up은 수동형으로 사용 못합니다. (성장 되어지다??)