Learn Hardcore Finnish: Vaihda salasana säännöllisesti, jotta tilisi pysyy turvassa. - Change the password regularly so that your account stays safe.

Vaihda is the second person singular imperative form of the verb vaihtaa (to change). It’s a command telling “you” (one person) to change something—in this case, your password.

Why is säännöllisesti used here, and what part of speech is it?

Säännöllisesti is an adverb formed from the adjective säännöllinen (regular). It modifies the verb vaihda, specifying how you should change your password—regularly.

Why is there a comma before jotta?

In Finnish, you generally separate the main clause from a subordinate clause (like a purpose clause) with a comma. Here, the comma marks the border between Vaihda salasana säännöllisesti (main clause) and jotta tilisi pysyy turvassa (subordinate purpose clause).

What is the function of jotta, and how is it different from että?

Jotta introduces a purpose clause (“so that…”). It explains why you do something. In contrast, että introduces a content clause (“that…”) and reports a fact or statement rather than purpose.

What does the suffix -si in tilisi indicate?

The suffix -si is the second person singular possessive suffix. Tilisi literally means your account (not someone else’s).

Why is tilisi in the nominative case here?

In the subordinate clause jotta tilisi pysyy turvassa, tilisi is the subject of the verb pysyy (remains), and subjects appear in the nominative case in Finnish.

What case is turvassa, and what does it express?

Turvassa is the adessive case of turva (security/safety), used here to express a state or condition—“in safety.”

Why is there no word for “your” before password?

Finnish uses possessive suffixes instead of separate possessive pronouns. Salasana has no -si suffix here because it’s an object of the imperative “change,” not showing possession; in context it’s understood to be your password.