兄は後ろからついて来る弟を置いていかない様に歩きますって英語でなんて言うの?
お兄ちゃんが弟と一緒に歩く時に、歩みの遅い弟が追いつくのを待って歩き進む様子です。
回答
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The boy slows down so that his little brother who follows him won't be left behind.
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The little boy follows his big brother around, and the big brother is careful not to leave him behind.
ついてくる = to follow, to accompany, to go with (someone)
置いていく = leave (someone) behind