Paina vihreää painiketta.

Paina is the 2nd person singular imperative of painaa.

So it means Press! when speaking to one person.

The basic dictionary form is painaa = to press.

Finnish usually leaves subject pronouns out when the verb already shows the person.

Here, paina already tells you that the command is directed at you (singular), so sinä is not needed.

This is very normal in Finnish, especially in commands.

They are both in the partitive singular.

• vihreä → vihreää
• painike → painiketta

In Finnish, an adjective normally matches the noun it describes in case and number, so both words change together.

Because Finnish does not leave adjectives and nouns unchanged the way English often does.

The basic forms are:

• vihreä = green
• painike = button

But in this sentence, the noun phrase is in the partitive singular, so both words take partitive forms:

• vihreä painike → vihreää painiketta

This kind of agreement is a very important Finnish pattern.

Because with painaa in the sense to press, Finnish normally uses the partitive object.

So Paina vihreää painiketta is the natural, idiomatic way to say Press the green button.

A useful way to think about it is that you are applying pressure to the button, not treating it as a completed whole in the same way as, for example, Eat the apple.

So although Finnish objects can appear in different cases, with this verb and meaning, the partitive is what you usually expect.

Usually no, not as the normal instruction.

For this meaning, Finnish normally says Paina vihreää painiketta.

So this is a good example of something you often just have to learn together with the verb: painaa meaning press commonly takes a partitive object.

That is just part of the normal inflection pattern of this type of noun.

The basic form is painike, but in the partitive singular it becomes painiketta.

Many Finnish nouns do not form cases by simply adding one ending to the dictionary form without any other change. The stem can change a little too. So it is best to learn:

• painike = basic form
• painiketta = partitive singular

No. Finnish has no articles like a, an, or the.

So Paina vihreää painiketta can mean:

• Press the green button
• Press a green button

In real life, the context usually makes it clear which one is meant. In this kind of instruction, English will normally use the.

Yes, but the given order is the most natural one here.

Paina vihreää painiketta is the normal order for a simple instruction:

• verb first: Paina
• then the object: vihreää painiketta

Also, the adjective normally comes before the noun:

• vihreää painiketta = green button in the required case

A different order is possible for emphasis, but it would sound marked, not neutral.

A simple pronunciation guide is:

PAI-na VIH-re-ää PAI-ni-ket-ta

A few useful points:

• Stress is on the first syllable of each word.
• ai sounds roughly like the vowel in eye.
• ä is not the same as English a; it is a front vowel.
• ää is a long vowel.
• tt is a long consonant.

In Finnish, vowel and consonant length matter, so saying them clearly is important.

You would use the plural imperative:

Painakaa vihreää painiketta.

This is used for:

• you all, press the green button
• polite you to one person in formal situations

So:

• Paina = command to one person
• Painakaa = command to several people, or polite/formal you