What are the different forms of the verb fly?

The different forms of the verb fly include base form, past tense, past participle, present participle, third person singular, and various phrasal forms, with some irregularities. Base form is fly, as in birds fly. Third person singular present is flies, as in time flies, bird flies. Present participle or gerund is flying, as in flying high, time is flying. Past tense is flew, as in bird flew away, plane flew yesterday. Past participle is flown, as in has flown, have flown, bird has flown. So principal parts are fly, flew, flown, flying, flies. There are also verb forms with prefixes like outfly, overfly, with their own conjugations outflew, outflown. Phrasal verb forms include fly away, fly off, fly over, fly by, fly out, fly in, fly into, fly through. In transitive use, fly can mean to operate aircraft, as in fly a plane, fly a kite, fly a flag. There is also causative use. In slang, fly as adjective is not verb form but separate. So different forms of verb fly are fly, flies, flying, flew, flown, plus phrasal verbs and compound forms. Understanding these forms helps in grammar, as fly is irregular verb with flew as simple past and flown as past participle used with have, has, had.