the difficult thing with Greek language is, sometimes words change completely when tense changes eg in English kick-kicked it is just add ed but with Greek words they tend not to follow the same structure, they act like GO, WENT, GONE ,but what I realised even if you dont speak Greek well, the Greeks will understand what you mean, but if English is your second language when you speak to English they will not understand you :)
Very good video, but please could you make more structure.. present-future-past, present-future-past, or other present-past-future, present-past future, its easier to train the verbs like that