Conjunctions
According to their signification conjunctions may be divided into—
(a) Copulative—ja, ynnä, and sekä, also; sekä... että, both... and; ka, kä (enclitic), and.
(b) Disjunctive—eli, tahi, tai, taikka, or; joko... tai, either... or.
(c) Adversative—mutta, vaan, but; kuitenkin, toki, however.
(d) Inferential—sentähden, siksi, therefore; siis, niin-muodoin, consequently; niin, so, accordingly.
(e) Causal—sillä, for; kun, koska, because.
(f) Comparative—kuin, than; ikäänkuin, as, if.
(g) Temporal—kun, when; jahka, heti kuin, as soon as; ennenkuin, before that; sittenkuin, after that.
(h) Final and Consecutive—että, jotta, that.
(i) Conditional—jos, if.
(j) Concessive—vaikka, jos, kohta, even if.
(k) Interrogative—ko, kö (enclitic), tokko, josko, vai, is it... or (like the Latin ‘utrum’... ‘an’).
It will be noticed that these conjunctions are in great part merely cases of pronouns or adjectives, e.g. sentähden, kuin, sillä. Ynnä appears to be a contracted essive from yksi; and ja and toki to be borrowed words.