Is it de or het keer?

de keer

de-word

times

/də keːr/

Plural

de keren

Why de

This one you just learn — no rule points to de here.

In a sentence

Ik ben één keer in Parijs geweest.

I have been to Paris once.

More de-words

The de/het checker covers one word. The full platform covers vocabulary, grammar and all five DUO sections.