How do you say I will never forget in Portuguese?

There are a few ways to say "I will never forget" in Portuguese, depending on the context and desired level of formality:

Formal:

* Nunca me esquecerei: This is the most literal translation and is very formal.

* Jamais esquecerei: This is similar to "never" and is also very formal.

Informal:

* Não vou esquecer nunca: This is a more common way to say it and is less formal.

* Nunca vou me esquecer: This is similar to the formal version but uses the informal pronoun "me" instead of "me"

* Vou lembrar-me para sempre: This translates to "I will remember forever" and is a more poetic way to say it.

You can choose the best translation based on the context and your level of familiarity with the person you're speaking to.