Present tense: ich reite, du reitest, er/sie reitet, wir reiten, ihr reitet, sie/Sie reiten
Imperfect / preterite (regular): ich ritt, du rittst, er/sie ritt, wir ritten, ihr rittet, sie/Sie ritten
Perfect tense (sein): ich bin geritten, du bist geritten, er/sie ist geritten, wir sind geritten, ihr seid geritten, sie/Sie sind geritten
(This verb forms its perfect tense with "sein" if you wish to emphasise the change of location that has occurred because of the ride. For example: "Die Prinzessin ist durch den dunklen Wald geritten" = "The princess has ridden through the dark woods".)
Perfect tense (haben): ich habe geritten, du hast geritten, er/sie hat geritten, wir haben geritten, ihr habt geritten, sie/Sie haben geritten
(This verb forms its perfect tense with "haben" when you are expressing that you "have ridden something" i.e. when the verb takes a direct object or if you wish to express the duration of the ride. For example: "In unserer Jugend haben wir gern geritten" = "We liked riding when we were young".)
Pluperfect tense (sein): ich war geritten, du warst geritten, er/sie war geritten, wir waren geritten, ihr wart geritten, sie/Sie waren geritten
(This verb forms its pluperfect tense with "sein" if you wish to emphasise the change of location that had taken place because of the ride. For example: "Wart ihr in das Dorf geritten?" = "Had you ridden into the village?")
Pluperfect tense (haben): ich hatte geritten, du hattest geritten, er/sie hatte geritten, wir hatten geritten, ihr hattet geritten, sie/Sie hatten geritten
(This verb forms its pluperfect tense with "haben" when you are expressing that you "had ridden something" i.e. when the verb takes a direct object or if you wish to express the duration of the ride. For example: "Wer hatte dieses Pferd in den Stall geritten?" = "Who had ridden this horse into the stable?")
Imperative: reit(e)! reitet! reiten Sie!
Present Participle: reitend
Past Participle: geritten