tehtyään

Tehtyään is a Finnish adverbial participle (converb) meaning "having done" or "after having done." It is used to express an action that was completed before another action in the sentence, allowing a concise connection between two clauses without a coordinating conjunction.

Formation and behavior: Tehtyään is built from the past passive participle tehty (done) of the verb tehdä (to do/make), with a converbial ending that marks anterior action. The form is invariant for person and number, and it typically attaches to a preceding phrase or clause. It is most common in written Finnish and in formal or literary style; it is less frequent in everyday spoken language.

Usage: The construction conveys sequence of actions and can carry a sense of causality or result. It often appears at the front of a main clause or directly before the main clause, separated by a comma. The subject of the subordinate clause is not explicitly stated; the agent is usually indefinite or inferred.

Examples:

- Tehtyään kotitehtävänsä, hän meni ulos. (Having done his homework, he went out.)

- Tehtyään päätöksen, hallitus ilmoitti suunnitelmista. (Having made the decision, the council announced the plans.)

Notes: Tehtyään is one of several past adverbial participles in Finnish. It should be distinguished from the present active converb tehdessä (doing) and from other participial forms, which may express different aspects or voices. In contemporary speech, alternative constructions using conjunctions (kun, sen jälkeen kun) or the present participle form (tehden) may be preferred for clarity.

See also: Finnish grammar, participles, converb.