На куртке не хватает одной пуговицы, и я ищу новую.

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Breakdown of На куртке не хватает одной пуговицы, и я ищу новую.

• новый: new
• и: and
• на: on

Questions & Answers about На куртке не хватает одной пуговицы, и я ищу новую.

Why does Russian use на куртке here instead of в куртке?

Because the button is understood as something attached on the jacket, not something located inside it.

• на куртке = on the jacket
• в куртке = in the jacket

Russian often uses на for things that are on a surface or fastened to clothing: buttons, pockets, badges, stains, and so on.

What does не хватает mean here?

Не хватает is from не хватать, which often means to be lacking, to be missing, or not to be enough.

So here it literally means something like:

• On the jacket, one button is lacking

In more natural English, we say One button is missing from the jacket.

Why use не хватает instead of just нет?

Because не хватает suggests that something which should be there is absent.

• нет = there is no / there isn’t
• не хватает = something is missing; there is a shortage/lack

For a jacket, buttons are expected parts of it, so не хватает is very natural. It implies an incomplete set.