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の忘れないでよ

don't forget to

→ の
phrase Uncommon #17,564
don't forget to Used after the dictionary form of a verb, as in するの忘れないでよ, meaning “don't forget to do it.” The よ adds emphasis and makes the reminder sound more direct or insistent.
JA: 明日、宿題を提出するの忘れないでよ。
EN: Don't forget to turn in your homework tomorrow.

シートベルトするの忘れないでよ。

Don't forget to buckle up.

私が出すの頼んでおいた手紙にさ、切手貼るの忘れないでよ。

Don't forget to put a stamp on the letter I asked you to mail.

帰りにパン買うの忘れないでよ。

Don't forget to buy some bread on your way home.

学校に行く時、この手紙を出すの忘れないでよ。

Don't forget to mail this letter when you go to school.

ペンを持ってくるの忘れないでよ。

Don't forget to bring a pen.

トムのプレゼント買うの忘れないでよ。

Don't forget to buy Tom's present.

手を洗うの忘れないでよ。

Don't forget to wash your hands.

救急箱、持ってくるの忘れないでよ。

Don't forget to bring the first-aid kit.

帰りにパン買ってくるの忘れないでよ。

Don't forget to pick up some bread on your way home.

薬を飲むの忘れないでよ。

Don't forget to take your medicine.