imperf. ind., and in the past participle; as, at skrive, 'to write,'—i. i. skrev, p. p. skrevet.
3. Verbs in which the radical vowel changes only in the imperfect tense; as, at lide, 'to suffer,'—i. i. led, p. p. lidt.
4. Verbs in which different vowels replace the radical vowel in the imperf., and the past participle; as, at drikke, 'to drink,'—i. i. drak, p. p. drukket.
The changes in the radical vowels of irregular verbs are similarly amenable to certain rules; thus:
1. æ and e frequently change to a or å in the imperfect indic.; as, at træde, 'to tread,'—i. i. trådte, p. p. trådt; at bede, 'to pray,'—i. i. bad, p. p. bedt.
2. i changes to a and to e; as, at sige, 'to say,'—i. i. sagde, p. p. sagt; at blive, 'to remain,'—i. i. blev, p. p. bleven, blevne.
3. ö changes to u; as, at dölge, 'to endure,'—i. i. dulgte, p. p. dulgt.
The largest number of irregular verbs form their past tense in a or e; as, at vælge, 'to choose,' i. i. valgte; at synge, 'to sing,' i. i. sang; at binde, 'to bind,' i. i. bandt; at rive, 'to tear,' i. i. rev; at skrige, 'to cry out,' i. i. skreg.
Where a verb can be used both transitively and intransitively, it usually follows in the first case the 'weak' (regular), and in the second case the 'strong' (irregular) mode of conjugation; as, at hænge, 'to hang,' trans. hængte, intrans. hang. Han hængte Kjolen på Træet, 'He hung
