|PRESENT PERFECT SIMPLE
||PRESENT PERFECT PROGRESSIVE
|Bei Erwähnung der Häufigkeit der Handlung
||Hier ist nur das Fortdauern wichtig
|Ex: He has written three letters.
||Ex: He has been writing letters.
|Ex: I have tried to phone him several times.
||Ex: I have been trying to phone him all the time.
|Handlung abgeschlossen / Resultat wichtig
||Fortdauer, noch nicht abgeschlossen
|Ex: Tom has repared his bike.
||Ex: Tom has been repairing his bike, but hasn't finished yet.
|Ex: I have read 'Ulyssees'.
||Ex: I have been reading 'Ulyssees'. (...and will never finish....-;))