GRAMMAR DETAIL

～一つも～ない

not a single · not even once

Combines a quantity expression with negation to emphasize the complete absence of something or an experience.

Examples

説明を聞いたあと、質問は一つもありませんでした。

After hearing the explanation, there wasn't a single question.

私はまだ海外へ一度も行ったことがありません。

I have never been abroad even once.

冷蔵庫には卵が一つもありません。

There isn't a single egg in the refrigerator.

Structure: Combine a minimum quantity expression with も and negation to emphasize that there is not even one.
Basic usage: 冷蔵庫には卵が一つもありません。 means that there are no eggs left.

None and only a small number
- 一つもない gives a quantity of zero, while 一つしかない says that one exists but presents it as few. Both use negative forms, but their actual quantities differ.
The unit matches what is counted
- 一つもない denotes no objects or items, 一人もいない no people, and 一度も行ったことがない no experience of visiting. Choose the unit according to what is counted.