Clarify when to use では vs じゃ

Here are some examples:

• 綺麗ではありません → polite form (formal)
• 綺麗じゃありません → polite form (spoken)
• 綺麗じゃない → plain form (casual negative)
• 綺麗じゃなかった → plain past negative
• 綺麗じゃなかったです → polite past negative

These examples show just how flexible Japanese can be — depending on who you’re talking to and the situation you’re in.

This kind of nuance is everywhere in daily life and business.

To really connect with people in Japan — and to survive in a professional environment — learning how and when to shift between casual and formal forms is absolutely essential.