Learn Danish: Jeg har kun ti kroner. - I only have ten kroner.

In Danish main clauses, central adverbs like kun (only), ikke (not), and også (also) must come right after the verb. So the literal word order is "I have only" (Jeg har kun) rather than "I only have".

Could I use bare instead of kun in this sentence?

You really need kun here. kun is used for strict physical limits, especially with numbers, prices, or amounts (meaning "nothing more than"). bare translates more to "just" or "simply" and is used to soften statements, like in slap bare af (just relax).

How do you form the plural of the currency here?

The singular is en krone. Because the word already ends in an -e, you simply add an -r to make the plural kroner. This is the standard plural rule for most Danish nouns that end in an unstressed -e.

Is har acting as a helping verb in this sentence?

No, in this sentence har is the main verb, meaning "to possess" or "to own" (I possess ten kroner). It only acts as a helping verb when it is followed by another verb, like in Jeg har betalt (I have paid).