Learn Finnish: Me palaamme yhdentenätoista. Minä muistan päivämäärän. - We will return on the eleventh. I remember the date.

The basic word for 'eleventh' is yhdestoista. To say that something happens on a certain date, Finnish uses the essive case, which adds -na or -nä. For teen numbers (11-19), only the first part of the word changes. The stem of yhdes- is yhdente-, which becomes yhdentenä. The -toista part stays exactly the same.

The English translation says 'will return', but why is there no future tense word in Finnish?

Finnish doesn't have a dedicated future tense! Instead, you just use the present tense verb (palaamme, meaning 'we return'). The context—in this case, mentioning a specific upcoming date—makes it clear to the listener that the action is happening in the future.

Why does the word for date (päivämäärä) end in an -n in this sentence?

It is the direct object of the verb muistan (I remember). Because you are remembering the entire date (a complete action), the object takes the genitive-accusative case, adding an -n to the basic nominative word päivämäärä.

What are the parts of the compound word päivämäärä?

It is made up of päivä (day) and määrä (amount, quantity, or number). So it literally translates to 'day amount' or 'day number', which is a very logical way to say 'date'!