Answer: first, you recognize them because the question mark is ; and not ?. After it depend on the Greek, as sentences are not built up the same way in the 8th bc, first bc, 2 ac, 10ac or today. For today, they are relatively simply. As in all other languages you need an interrogativ particle like what, who, where, which are ti (what) pios, pia, pio (who, male, female, neutre) pou (where) gia ti (why) pote (when) etc. And then the verb follows with the corresponding attributes, if of need. Thus: Ti kaneis? (What do you do, for = how are you?) Pios ta ekane afta? (Who did this?) Pou eisai (Where are you) or Gia ti den eirthes noritera? (Why didn’t you come earlier) Pote tha arxisi to pexnidi (When will the game start?) – If you want to have forms of the third to first bc, have a look at septuaginta. If you want to have forms of the 8th bc have a look at Homer. 5th is Plato, Aristotle and Sophocles. Byzantine Greek is difficult to find.
Septuaginta (Genesis) http://spindleworks.com/septuagint/Genesis.htm
How did you know you were naked?
Where are you?
tis anhggeilen soi oti gumnos ei; –
pou ei; –