Present Indicative

• All --ω verbs are regular, i.e. have the same endings. There are no irregular --ω verbs in the present tense. Even the ones that look a little different! They are not irregular, they are contractions, obeying a few not too impossible to remember rules.
   
• In English we have to use pronouns if we want people to understand what we mean.
  What would this mean? Often go to the cinema.
  Go on!, go there often!? We go? They go? I go?
   
  But in Greek we do not need pronouns, except for emphasis, to insist on the fact that it is I, me, not he, him who does, is, did, will do it.The verb ending says it all. So:
  

  If we use the wrong verb-ending, we will not be understood.

  As simple as that, nothing to do with theoretical grammar, but with down-to-earth, practical, everyday usage. And that you only learn through forcing yourself to consciously think each time:

  This is what is meant when it sounds like this:
  Try and see the action portrayed with your mind's eye αἴρομεν λίθους: we do it, lift stones
  στενάζεις; do you personally do it, groan and moan?
  διὰ τί χαίρει; Why does he do it, rejoice?
  βαδίζουσιν βραδέως: they do it, walk along slowly
  ἤδη κάμνω: I am already tired now.

  Reeling verb-forms off mechanically is not going to give you a feel for those forms. Because when you do that, you think of the succession of forms, not of their meaning.
   
• In Greek, like in Latin (and English of course) there is no polite you form: if we talk to one person we use the ending -εις, no matter whether friend, child, boss or king.