Formal vs Informal Register Switching in {TARGET_LANGUAGE}

Say the wrong register and you sound rude to a stranger or stiff to a friend. Give it ten everyday messages, and it writes each one twice, formal and informal, then points to the exact words, verb forms and structures that flip the tone. You stop guessing which version to use and start hearing the difference.

Compare how the same ten everyday messages would be expressed in both formal and informal registers in {TARGET_LANGUAGE}. The messages are:

{MESSAGE_LIST}

For each message:
- Write a formal version (suitable for email, official settings, strangers).
- Write an informal version (suitable for friends, family, casual chat).
- Highlight the specific words, verb forms, or grammatical structures that signal each register (e.g. tu vs vous in French, du vs Sie in German, tú vs usted in Spanish).
- Note any traps where {NATIVE_LANGUAGE} speakers commonly use the wrong register and why it can cause offence or seem strange.
Finish with a concise rule-of-thumb guide for knowing which register to use in {TARGET_LANGUAGE} culture.