hk generally becomes simply h, but may remain unchanged; tuhka, ash, genitive tuhan, but sometimes tuhkan; sähkö, electricity, genitive sähön. In old Finnish such forms as tuhvan are found.
28. (4) Between two vowels k generally is lost altogether when the syllable is closed; tako, forge, taon, I forge; vika, a fault, genitive vian.
If the k is preceded by a diphthong ending in i or by simple i, a j is developed when k falls out: thus aika, time, poika, boy, ikä, life, make ajan, pojan, ijän. Similarly when k falls out between two u’s or two y’s, a v is developed, at any rate in pronunciation. The orthography varies between uu and uvu, but the latter is generally adopted when there is any ambiguity, e.g. puvun, from puku, clothes, not puun, because this is liable to be confused with puun, the genitive of puu, a tree; suvun from suku, a family; but suun from sun, a month; luvun from luku, a number, but luun from luu, a bone.
29. (5) sk, tk remain unchanged, lasku, laskun, itku, itkun.
T.
30. (1) tt becomes t, opetta, teach, opetan, I teach.
31. (2) lt, rt, nt become ll, rr, nn. Pelto, field, pellon; parta, beard, parran; kanta, base, kannan.
32. (3) After a vowel or h, t becomes d. Pata, pot, padan; tahto, wish, tahdon[7].