- Second-conjugation verbs type a Verbs of the second conjugation are dived in two types,according to vowel which predominates in the endings of the active present tense.Those of the first type (A) are characterized by the –α vowel in the endings of this tense. Verbs type A Απαντώ= I answer, κολυμπώ= I dive , γελώ=I laugh,γεννώ= I give birth (to), περπατώ=I walk,διψώ= I am thirsty,κολλώ= I stick,κρατώ= I hold etc Present (active voice) I hit= χτυπάω/χτυπώ Ενεστώτας χτυπώ/-άω χτυπάς χτυπά/-άει χτυπάμε/-ούμε χτυπάτε χτυπούν(ε)/χτυπάν(ε) http://ebooks.edu.gr/modules/ebook/show.php/DSGYM-A112/621/4006,17975/ this is a useful site also. I wrote to you how to conjugate the verb with more details you can see in the link.It is the same meaning if you tell μιλάω ή μιλώ =I speak for example, I speak Greek=Μιλώ/Μιλάω ελληνικά.

It has 2 forms at the first person singular. άω and ώ. But they are absolutely the same. You use them both. άω version is more used.

After seeing your comment in Penelope's answer, I want you to know that, generally, verbs ending in -άω are considered more formal that the ones that end with -ώ. It's the same verb, with the same meaning, but the proper way to write it is with -άω. In modern Greek, though, the two letters have been joined together into the remaining -ώ.