How do you say

How would you say "you will not be forgotten" in Japanese?

Hi,

It depends on the context. As far as it is expressed in the passive form, it is natural to imagine that there are more people around the speaker including absent people that had something to do with "you". I do not think that English speaker would use passive form if he/she is speaking to the person "you". Then I would add "Nobody" as a subject of the sentence because passive expression in Japanese will sometimes sound very clumsy.

  誰も君のこと（を）忘れたりしないよ。誰もあなたこと（を）忘れたりしませんよ。

”たり” adds more stress on ”forget”.

 In Japanese situation is quite important. Who are there on the scene, who they are ( child, adult, male, female) or their relationship. This kind of information influences very much on the expression. So it is often very hard to translate only once English sentence into Japanese. Better to give more context how an expression has been brought.

How do you say

How would you say "you will not be forgotten" in Japanese?

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It is literally translated into;

　あなたは　忘れられ　ない　でしょう。

Practically;

　あなたを忘れません。

　I will not forget you.

Casually you could say;

　あなたの事、忘れないよ。

　I will not forget you.

The sentence ending particle ”よ” is used to indicate

the speaker’s assumption, intention, or other subtle nuances.

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Note: In Japanese if the speaker's expectation is fixed,

usage of present tense is more natural.

I'm not a proffessional Japanese language teacher,

so I'm sorry if I'm wrong.

How would you say "you will not be forgotten" in Japanese?

あなたは忘れられることはありません

(I got this from a Japanese person so it should be right )