9

This particular problem affects most of the verbs in which [д] of the stem alternates with [жд] in their imperfective infinitive and past tense forms. These belong to a group of verbs called defective verbs or verbs with deficient 1st person paradigm: по-/у-/разубеждать/л → по-/у-/разубежу (?) под-/утверждать/л → под-/утвержу (?) учреждать/л → ...


3

The short answer that any Russian speaker will instantly give you is that all potential forms - побежу, победю, побежду - just sound somewhat bad. They just cause a weird subconscious reaction in any native Russian speaker and somewhat disrupt the perception of the speech. Explaining the exact reasons why this happens would require going into detail of how ...


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