N2 — outside your level filter

Modifies the end of the sentence directly and takes no だ／です, so there are no forms to conjugate.

いっせいに

isseiniall at once, all togetherN2adverb

Example sentences2

合図あいずとともに、選手せんしゅたちがいっせいに走はしり出だしました。

aizu to tomo ni, senshutachi ga isseini hashiridashimashita.

At the signal, the athletes all started running at once. neutral

みんないっせいに笑わらい出だしたから、私わたしもつられちゃった。

minna isseini waraidashita kara, watashi mo tsurarechatta.

Everyone burst out laughing all at once, so I got swept up in it too. casual