How is the bolded word being used? have you eaten squid before?

The word Before in the question "Have you eaten squid BEFORE? is used as an adverb.

Explanation:

There are many uses for the word before, it can be used as a preposition, a conjunction or an adverb, just to give some examples, it depends on the place it takes in the sentence as well as the grammatical function it communicates, in this question since it is located at the end it is used as an adverb, this is one of the grammatically correct uses.

(i'm bad at sudden poems so don't yell at me i'm trying to represent sadness or something like that but its real hard)

at the age of 4, she thought everything was better.

she was innocent, she was joyful, despite the predictions about the bad weather.

at the age of 10, she started to figure things out.

in life, in its meaning, she started to doubt.

at the age of 14, she was filled with depression, anxiety and fear,

that nobody cared about her, and death was drawing near.

at the age of 17, her sleeves got longer, her will got shorter, until she couldn't take it anymore.

she left this earth with a rope, chair and to the heavens she would soar.