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STRONG VERBS CLASS I
The strong verbs of the 1st class have the stem vowel /í/ (which cannot be i-umlauted). In the preterite tense it changes into /ei/ in the singular and /i/ in the plural. In the perfect it's also /i/.
This verb class consists of verbs from PIE roots with the diphtong /ei/, which in its e-grade turned into a long /i:/ in germanic (bheid-o-no-m > bíta). The PIE perfect tense had the o-grade in the singular and the zero-grade in the plural, which rendered the ON preterite tense stem vowels/diphtongs /ei/ (< /ai/ < /oi/) and /i/ (< /i/). The perfect participle also had the zero-grade (/i/ < /i/).
© Peter Pettersson