Irregular Verb Forms Cheatsheet

The past simple stands alone as the main verb of a finished action ("I saw the film yesterday"). The past participle only appears combined with an auxiliary verb — "have" for perfect tenses ("I have seen the film") or "be" for the passive voice ("The film was seen by millions"). For regular verbs the two forms are identical (walked/walked), which is exactly why irregular verbs — where they often differ, like saw/seen or went/gone — need to be learned as three separate forms.

There are loose patterns — verbs ending in "-ing" often shift to "-ung" (sing/sang/sung, ring/rang/rung), and several one-syllable verbs keep the same form throughout (put/put/put, cut/cut/cut) — but the patterns have enough exceptions that they're a memory aid, not a rule you can apply blindly. Grouping verbs by their pattern (as this page does) makes memorization faster than an alphabetical list, but there's no shortcut around actually learning each one.

A handful of common verbs — put, cut, hit, cost, hurt, let, set — never change form at all: "I put it down" (present), "I put it down yesterday" (past), "I have put it down" (participle). These survive unchanged from Old English forms that resisted the regularization most other verbs went through, and they're some of the easiest irregular verbs to learn precisely because there's nothing to distinguish.

A small set does. "Learn," "spell," "burn," and "dream" take a regular -ed ending in American English (learned, spelled) but often use an irregular -t ending in British English (learnt, spelt) — both are correct within their own variety. "Get" is the biggest split: American English uses "gotten" as the past participle ("I have gotten better"), while British English uses "got" for both past simple and participle. Neither form is wrong; pick the one that matches the English variety you're writing in.