Permission and prohibition

Core meaning and form

Use て-form + もいい for permission and て-form + はいけない for prohibition. In conversation, てもいいですか asks permission; prohibitions are often softened unless a firm rule is intended.

• Form: Use て-form + もいい for permission and て-form + はいけない for prohibition.
• Core use: These patterns ask or state whether an action is allowed.
• Context: In conversation, てもいいですか asks permission; prohibitions are often softened unless a firm rule is intended.

Examples in context

Common errors

• Do not select this pattern from an English translation alone; check its attachment and discourse function.
• Keep the surrounding sentence in a consistent plain, polite, spoken, or written register.

Quick summary

• Use て-form + もいい for permission and て-form + はいけない for prohibition.
• These patterns ask or state whether an action is allowed.
• In conversation, てもいいですか asks permission; prohibitions are often softened unless a firm rule is intended.