Formal:
* Je t'aime: This is the most common and versatile way to say "I love you" in French. It can be used for romantic love, familial love, and platonic love.
* Je vous aime: This is a more formal way to say "I love you" and is typically used when addressing someone in a position of authority or someone you don't know very well.
Informal:
* Je t'aime: This is the most common and versatile way to say "I love you" in French. It can be used for romantic love, familial love, and platonic love.
* Je t'adore: This is a more passionate way to say "I love you" and is usually reserved for romantic relationships.
* J'aime beaucoup: This is a less intense way to say "I love you" and can be used for friends, family, or even things like food or hobbies.
Other expressions:
* Je suis amoureux(se) de toi: This means "I am in love with you" and is a more poetic and romantic way to express your feelings.
* Tu es mon amour: This means "You are my love" and is a very affectionate way to say "I love you."
It's important to note that the specific way you say "I love you" in French will depend on your relationship with the person you're talking to and the context of the situation.