Formal:
* Moi aussi (pronounced: mwa oh-see) - This is the most common and neutral way to say "I too."
* De même (pronounced: duh mem) - This is a more formal way to say "I too" and is often used in written French.
Informal:
* Moi pareil (pronounced: mwa pa-ray) - This is a more informal way to say "I too" and is often used among friends.
* Pareil (pronounced: pa-ray) - This is a very informal way to say "I too" and can be used with close friends.
Examples:
* "J'aime le chocolat. Moi aussi." (I like chocolate. Me too.)
* "Je suis fatigué. De même." (I am tired. Me too.)
* "J'ai faim. Moi pareil." (I am hungry. Me too.)
* "Tu veux aller au cinéma ? Pareil." (Do you want to go to the movies? Me too.)
The best way to choose the right phrase is to consider the context and your relationship with the person you are talking to.