Perfect English can be expressed in various ways depending on the context:
1. Flawless English - refers to impeccable language skills
2. Native-like English - describes non-native speakers who speak like natives
3. Polished English - indicates refined and sophisticated language use
4. Perfect English - the most straightforward translation
Cultural note: The concept of "perfect English" varies across cultures, with different standards in the UK, US, Australia, etc.