Irregular conjugation for the verb "erwägen": there is a vowel change in the stem of Present tense ("ich erwäge"), the stem of Preterite ("ich erwog") and the stem of Past Participle ("erwogen"). The verbs "sägen", "prägen" und "schrägen" follow other conjugation pattern.
To see other models, refer to Model Table
Based on the ending, you can identify features that different verbs have in common. Click on the verbs above to see their conjugation tables and explore their conjugation patterns.