lämmitettiin

lämmitettiin is the passive past tense form of the Finnish verb lämmittää, which means "to heat". Therefore, lämmitettiin translates to "was heated" or "were heated". This grammatical form indicates that an action of heating was performed on a subject, but the agent performing the action is either unknown, unimportant, or implied from context.

For example, if someone said "Vesi lämmitettiin" (The water was heated), the focus is on the water having been heated, not on who or what did the heating. This contrasts with the active past tense, such as "Hän lämmitti veden" (He/She heated the water), where the agent is explicitly stated.

The passive voice in Finnish, including forms like lämmitettiin, is commonly used in everyday language and in more formal writing. It allows for a shift in emphasis, moving the focus from the doer of the action to the receiver of the action. This can be useful when discussing processes, events, or situations where the object being acted upon is of primary importance. The structure of the passive voice in Finnish is often formed by adding the suffix -ttiin to the verb stem.