~られる・~える (可能)
RuleVerb potential form (~rareru/~eru): "can do." More common in speech than koto ga dekiru.
Curiosity
You learned "koto ga dekiru." How do you make the shorter, more conversational "can do"?
Intuition
You re-dress the verb itself in "ability." Once it is potential, the object is usually marked with ga, not o (sashimi ga taberareru).
Visualization
nomu (drink) → nomeru (can drink). Shift the u-row to the e-row and add ru.
飲むdictionary (drink)
Essence
Ichidan: ~ru → ~rareru (taberu → taberareru; casual "ra-less" tabereru). Godan: shift the u-row to the e-row + ru (kaku → kakeru, nomu → nomeru). Irregular: suru → dekiru, kuru → korareru. For ichidan, where this overlaps the passive, context distinguishes them.
Examples
私は日本語が話せる。
I can speak Japanese.
漢字が読めますか。
Can you read kanji?
辛いものが食べられない。
I cannot eat spicy food.
Mini-quiz
What is the potential form of "kaku" (to write)?