N3 — outside your level filter

Is said whole, with nothing composed onto it and takes no だ／です, so there are no forms to conjugate.

シートベルトをしめる

shiitoberutowoshimerufasten one's seatbeltN3expression

Example sentences2

車くるまに乗のったら、まずシートベルトをしめる。

kuruma ni nottara, mazu shiitoberuto o shimeru.

Once you get in the car, the first thing you do is fasten your seatbelt. neutral

後うしろの席せきでもシートベルトをしめること、忘わすれないでね。

ushiro no seki demo shiitoberuto o shimeru koto, wasurenaide ne.

Don't forget to fasten your seatbelt even in the back seat, okay? casual