Present perfect + ever, never, already, yet

Ever

Los adverbios "ever" y "never" se refieren a un tiempo no identificado, anterior al presente (Have you ever visited Berlin?). "Ever" y "never" siempre se colocan antes del verbo principal (en "past participle"). "Ever" se utiliza:

En preguntas
Ejemplos

Have you ever been to England?
Has she ever met the Prime Minister?

En preguntas negativas
Ejemplos

Haven't they ever been to Europe?
Haven't you ever eaten Chinese food?

En oraciones negativas con "nothing+ever" o "nobody+ever"
Ejemplos

Nobody has ever said that to me before.
Nothing like this has ever happened to us.

Con "the first time"
Ejemplos

It's the first time that I've ever eaten snails.
This is the first time I've ever been to England.

Never

"Never" significa nunca antes de ahora y equivale a "not (...) ever": (I have never visited Berlin)

¡Cuidado!: "Never" y "not" no deben usarse juntos.

I haven't never been to Italy.
I have never been to Italy.

Already

"Already" se refiere a una acción que ha ocurrido en un tiempo anterior al presente pero no especificado. Sugiere que no es necesario repetir la acción.

Ejemplos

I've already drunk three coffees this morning. (= ¡y me estás ofreciendo otro!)
Don't write to John, I've already done it.

 

También se utiliza para preguntar:

Have you already written to John?
Has she finished her homework already?

 

"Already" puede colocarse antes del verbo principal (en "past participle") o al final de la frase:

I have already been to Tokyo.
I have been to Tokyo already.

 

Yet

"Yet" se utiliza en oraciones negativas e interrogativas, con el significado de (no) en el periodo temporal entre el pasado y el ahora, (no) hasta el momento presente, incluido éste. Suele colocarse al final de la frase.

Ejemplos

Have you met Judy yet?
I haven't visited the Tate Gallery yet
Has he arrived yet?
They haven't eaten yet