English speakers soon notice that Finnish has no everyday word for please. The politeness is built into the verb instead: a question in the conditional sounds warm and considerate, where the plain present can sound abrupt.

Plain	Polite (conditional)	English
Saanko kahvin?	Saisinko kahvin?	Could I have a coffee?
Voitko auttaa?	Voisitko auttaa minua?	Could you help me?
Haluan varata pöydän.	Haluaisin varata pöydän.	I'd like to book a table.
Onko sinulla hetki?	Olisiko sinulla hetki aikaa?	Would you have a moment?

Add kiitos at the end and you've got the full Finnish please: Saisinko laskun, kiitos? — Could I have the bill, please?

The question ending -ko / -kö simply goes on after the conditional: saisinko, voisitko, olisiko.