Question 1

Why does this sentence use elokuvateatterissa (in the cinema) instead of the movement case elokuvateatteriin (into the cinema)?

Accepted Answer

This is because of the verb käydä (to visit). In Finnish, käydä requires a static location case, like the inessive -ssa (in) or adessive -lla (at/on). Even though English says "go to", Finns express this as visiting or spending time "in" the location.

Question 2

Is käyn the same as menen (I go)?

Accepted Answer

Not exactly. While menen (from mennä) means a one-way "I go" and takes a movement case like elokuvateatteriin, käyn implies a round trip: you go to the cinema, watch a movie, and leave. Because it focuses on the completed visit itself, it uses the static -ssa ending.

Question 3

How is the word viikoittain (weekly) formed?

Accepted Answer

It comes from the noun viikko (week) plus the adverbial suffix -ttain, which expresses frequency or manner, meaning "every" or "by the". You can see this same pattern in other time words, like päivä (day) becoming päivittäin (daily).

Question 4

Why is there only one 'k' in viikoittain if the root word is viikko?

Accepted Answer

Adding the -ttain suffix triggers consonant gradation. Because the suffix starts with a double consonant, it closes the preceding syllable. This forces the strong double kk of viikko to weaken into a single k.

Käyn elokuvateatterissa viikoittain.

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