Aspect pairs are lexical, not mechanical
Treat prefixes as possible lexical changes, not automatic interchangeable perfectives.
Написать can be a conventional partner of писать, while записать, переписать, and подписать add distinct meanings such as record, rewrite, or sign.
- A prefix can add boundedness.
- A prefix can also create a new lexical verb.
- Learn aspect relations with meanings and usage.
Mini-check