Formal:
* Eu quero: This is the most common and straightforward way to say "I want" in formal contexts.
* Eu gostaria: This is a more polite and formal way to say "I want," similar to "I would like."
Informal:
* Quero: This is the shortened version of "eu quero" and is used in informal situations with friends and family.
* Eu desejo: This is a more formal way to express "I want," often used in more literary contexts.
* Eu tô querendo: This is a very informal way to say "I want" and is used by younger generations and in casual situations.
Examples:
* Eu quero um café. (I want a coffee.)
* Eu gostaria de um pedaço de bolo. (I would like a piece of cake.)
* Quero ir pra praia. (I want to go to the beach.)
* Eu desejo tudo de bom pra você. (I wish you all the best.)
* Eu tô querendo comer pizza. (I'm craving pizza.)
Remember that the specific way you choose to say "I want" will depend on the context and your relationship with the person you are speaking to.