What is the second form of fly?

What is the second form of fly refers to past tense form in verb conjugation, as verbs have three principal forms, first form base present, second form past tense, third form past participle. For verb fly, first form is fly, as in I fly today, birds fly. Second form is flew, past tense, as in I flew yesterday, bird flew away, plane flew over city. Third form is flown, past participle, as in has flown, have flown, bird has flown. So second form of fly is flew. This is irregular verb, so past tense does not add ed, it changes vowel to flew. Examples, present: I fly to New York every month, past second form: I flew to New York last month, present perfect with third form: I have flown to New York many times. So second form flew is used for simple past tense to describe completed action in past. There are also other forms like flies for third person singular present and flying for present participle. So answer, second form of fly is flew, used for past tense.