Formal:
* Eu amo você: This is the most common and formal way to say "I love you."
* Eu te amo: This is a more informal way to say "I love you" and is generally used among friends and family.
Informal:
* Amo-te: This is a very affectionate and intimate way to say "I love you," often used by couples or between close friends.
* Eu te quero muito: This translates to "I love you very much" and is a more gentle and less intense way of expressing love.
* Eu gosto muito de você: This means "I like you very much" and is a good option if you don't want to express "love" in a romantic sense.
Other expressions:
* Eu adoro você: This means "I adore you" and expresses a strong affection.
* Eu me apaixonei por você: This means "I fell in love with you."
Important Notes:
* The choice of expression will depend on the context and the relationship between the people involved.
* The pronoun "você" is used for "you" when addressing someone formally. "Tu" is used for "you" in informal contexts.
* The pronunciation of "eu" is "ay-oo" and the pronunciation of "te" is "tay."
Remember that using "eu te amo" or "amo-te" in a romantic context should be reserved for someone you are in love with.