We have seen bits and pieces of the Greek verbal system, but now it is time to learn more, and especially to learning about "parsing." You will learn enough to understand the information in a Strong's Bible when it says something like ηγαπησεν is a third person singular,aorist active indicative of αγαπαω meaning "he loved."
None needed
Optional: Read Greek for the Rest of Us, pages 48-50, 144-150.