(2) Before n in the conditional and participle II active;
(3) Before k in the imperative.
B. The root may then be further changed by assimilation—
(1) Before t in the infinitive. The roots tule, mene, pure make their infinitives tulta, mentä, purta, which become tulla, ennä, purra. But roots ending in se, like nouse, keep the infinitive in sta,—nousta; for st is not a group liable to assimilation. Further simplifications of consonantal groups may take place; for example, root syökse, to throw down, shortened to syöks, infinitive syökstä, becomes syöstä; root säkenöitse, infinitive säkenöits-tä becomes säkenöitä.
(2) The l, r, or t at the end of the closed root always assimilates the n of the conditional and of participle II active. The final s sometimes assimilates n; frequently in participle II, rarely in the conditional.
E.g. The roots tule, pure, kaitse, which in their closed forms become tul, pur, kait, form the conditionals tullee, purree, kainnee, and the participles tullut, purrut, kainnut. Nouse forms nousnee, rarely noussee and participle II nousnut or noussut.
C. A strong consonant at the beginning of the penultimate syllable in polysyllabic words is also liable to softening in forms derived from the closed root, but not in forms derived from the full root. Root rohkene, to dare; infinitive I rohjeta.
D. The final e is dropped in the imperfect.
E. The third sing. present has ee.
F. Trisyllabic roots in ne change n to t in the imperative, and have the infinitive I ending in ta preceded by a vowel so that ne is altogether lost; e.g. alene; imperative aletkoon; infinitive aleta.