Expresiones que se utilizan con Presente perfecto
Since

para un tiempo especifico

I have worked since 1990.

For

para un periodo de tiempo

My brother has played X-box for 5 hours.

Already
ya
I have already finished my Project
he terminado mi proyecto.
se usa en medio del auxiliar have y el verbo se usa para expresar que termina una actividad

Ya

Just
ya
They have just called to the police station.
Ellos ya llamaron a la estación de policías.
Se usa para indicar que en ese momento se ha realizado la actividad.
Ever
alguna vez
¿Alguna vez has viajado a Japón?

Have you ever traveled to Japan?

Never
nunca
papa nunca ha montado un caballo.

My father has never ridden a horse.

Mi

Still
aun, todavía
We still haven´t bought the tickets.
Nosotros todavía no hemos comprado los boletos.
Still se usa con negativo y se escribe siempre antes
del auxiliar.
Yet
aun, todavía
todavía no he comido sushi.

I haven`t eaten sushi yet.
She hasn’t finished her homework yet.

Actividad 4.
Resuelve el ejercicio. CHANGE THE SENTENCES INTO THE PRESENT PERFECT TENSE. ADD THE
TIME EXPRESSION IN PARENTHESES.
e.g. Those atheletes practice very hard. (recently)
Those athletes have practiced very hard recently.
1.- It is cloudy and cool. (all day)
_______________________________________________________________________________
2.- There are very few parties. (negative) (this semester)
_______________________________________________________________________________
3.- That chemist does a lot of research. (during the past three years)
_______________________________________________________________________________
4.- Marianne goes to Canada every Winter. (interrogative word question) (for the last four years)
_______________________________________________________________________________
5- The phone rang. (negative) (for the last two hours)

Yo