Why didn't you show your homework to your teacher?
Is there a reason why you didn't give your homework to your teacher?
ーWhy didn't you show your homework to your teacher?
「なんで先生に宿題見せなかったの？」
to show your homework to your teacher で「先生にあなたの宿題を見せる」
ーIs there a reason why you didn't give your homework to your teacher?
「先生に宿題を提出しなかったのには何か理由があるの？」
to give your homework to your teacher で「先生に宿題を提出する」
ーMake sure you show her your homework today!
「今日ちゃんと先生に宿題見せるんだよ！」
to make sure で「必ず〜する」
ご参考まで！
カナダ 
