Hmm, so you can't ask for something politely in Finnish? How do you distinguish?
Instead of adding superfluous words like "please" to the end of the sentence, in Finnish you conjugate the verb of the sentence to a "polite form" to indicate the intent. There's a dozen different forms to use, e.g. "imperative" to indicate that something must be done or "potential" to indicate that something might probably happen.
At least, according to Danish national stereotypes of Finns.
Do this => Tee näin
Can you do this => Voitko tehdä näin
Could you do this => Voisitko tehdä näin
Would you kindly do this => Olisitko ystävällinen ja tekisit näin
A too literal translation of the last would be: Could you be friendly and do this. "Would you do this, please?" I think would work in English, with approximately same politeness level.
That was an interesting fact about Finnish. Also, in England, it goes "Do this", "Could you please do this", with omission of the "please" considered rather rude :P
It's interesting to think of differences between languages and how that influences culture.
For instance in Chinese the verbs themselves do not change to express tense. Expressing tense, for example "I will do that", is made by usage of adverbs or putting the words in the proper context. Asian cultures apparently have a preference towards living in the present, probably more than any other cultures. Think Buddhism.