PRESENT PERFECT SIMPLE

Για να σχηματίσουμε τον Present Perfect Simple χρησιμοποιούμε το have/has και την παθητική μετοχή του ρήματος. 

e.g. I have started a new job 

Κλίση 

AFFIRMATIVE	INTERROGATIVE	NEGATIVE
I have worked	Have I worked?	I haven’t worked
You have worked	Have you worked?	You haven’t worked
He has worked	Has he worked?	He hasn’t worked
She has worked	Has she worked?	She hasn’t worked
It has worked	Has it worked?	It hasn’t worked
We have worked	Have we worked?	We haven’t worked
You have worked	Have you worked?	You haven’t worked
They have worked	Have they worked?	They haven’t worked

Κανόνες 

1. Για μια πράξη που άρχισε και τελείωσε στο παρελθόν, χωρίς να αναφέρεται το πότε. E.g. I have lost my keys 
2. Για μια πράξη που μόλις τελείωσε με το just. e.g. Mary has just finished her homework. Μην ξεχνάς όμως οτι με το just now χρησιμοποιούμε past simple!
3. Για μια πράξη που άρχισε στο παρελθόν και συνεχίζεται έως και τώρα. e.g. I have known her for ten years. 

Time expressions 

1. Just (μόλις). I have just done the dishes 
2. Already (ήδη). I have already ordered 
3. Since (από). I have studied English since 1998 
4. For (για). I have studied English for 23 years 
5. Yet (ακόμα). I haven’t finished my homework yet 
6. Ever/ never (ποτέ). Have you ever been to the States? - No, I have never been to the States before. 
7. How long (πόσο καιρό). How long have you been in Athens? 

Have been to/ Have been in/ Have gone to 

Have been to	Have been in	Have gone to
έχω πάει σε ένα μέρος και έχω γυρίσει.  e.g. I have been to Spain	Ζω, εργάζομαι κάπου μόνιμα.  e.g. I have been in Athens since 2010	έχω πάει κάπου αλλά δεν έχω γυρίσει ακόμα.  e.g. Dad has gone to the bank.