Learn Danish: Vi er ankommet til markedet for at købe et eksotisk krydderi. - We have arrived at the market to buy an exotic spice.

In Danish, verbs that indicate a change of state or movement from one place to another (like ankomme, to arrive) form the present perfect tense using at være (to be) rather than at have (to have). Therefore, we say er ankommet to mean "have arrived".

Why do we use for at købe rather than just at købe?

To express purpose or intention—meaning "in order to"—Danish requires the phrase for at before the infinitive verb. If you just used at købe, it wouldn't clearly convey that buying the spice is the specific reason for arriving at the market.

Since krydderi is an et-word, why doesn't the adjective eksotisk get a -t added to the end?

You usually add a -t to an adjective when it modifies a neuter (et) noun. However, there is a special exception for adjectives ending in -isk (like eksotisk, fantastisk, or typisk). They never take the -t ending in the neuter form, because adding a "t" after an "sk" sound is considered too clumsy to pronounce in Danish. So it remains et eksotisk krydderi.