The suffix -ed attaches to the end of most verbs to show that something already happened. When you walk to school this morning, you walked. When you finish your homework tonight, you will have finished it. The -ed ending often signals that an action is complete or in the past.

This tiny addition follows predictable patterns. Regular verbs simply add -ed: jump becomes jumped, climb becomes climbed, look becomes looked. When a verb ends in e, you just add d: hope becomes hoped, bake becomes baked. If a short verb ends in a single consonant after a single vowel, you often double that last letter: stop becomes stopped, plan becomes planned.

Not every verb follows this pattern. English has many irregular verbs that form their past tenses differently: run becomes ran, think becomes thought, go becomes went. These exceptions can be challenging for students learning English as a second language because there's no simple rule to follow.

The -ed suffix also creates adjectives that describe a state or condition. A tired student feels exhausted. A painted fence has paint on it. In these cases, -ed describes how something is right now, even though the original action happened earlier.