Yet

This adverb means you have not done something but you are planning to do it. We only use it in negative sentences with this meaning and in questions with the meaning “already”

We never use it in affirmative sentences.

For example: Have you seen it yet?

Already

This adverbs means that you have finished something before it was expected. We only use it in affirmative sentences and we never use it in negatives and questions. (for questions we use “yet”)

For example: Peter has already eaten a cake.

Just

This adverb means that you finished something very recently. the action is over but it is so close to the present that we can still use this structure.

For example: I have just heard it.

Recently

This adverb means recientemente in Spanish.

For example: He has not traveled recently.

Lately

This adverb means últimamente in Spanish.

For example: We have worked a lot lately.

Ever

This adverb is used almost exclusively in questions and it means “in all your life”

For example: Have you ever been here?

Never

This adverb is used in negative sentences and the meaning is “not a single time in the life”

For example: I have never been here.