Japanese by Example
Learning through examples in manga

Don't leave your vegetables 〜てはだめだ

Grammar Explanation: Must not do with 〜てはだめだ

Manga panel from ご注文はうさぎですか？ showing example of Don't leave your vegetables 〜てはだめだ.
ご注文はうさぎですか？ » Volume 1 » Page 75

During breakfast, Cocoa sees Chino avoiding the vegetable on her plate.

ココア:
「あっ　チノちゃんアスパラ残(のこ)しちゃだめだよ」
“Ah, Chino, you mustn'tleave your asparagus.”