Here's how it works:
* Regular verbs: These verbs form their past tense by adding "-ed" to the base form.
* Example: "walk" becomes "walked," "play" becomes "played."
* Irregular verbs: These verbs have their own unique forms for the past tense, and "-ed" is not used.
* Example: "go" becomes "went," "see" becomes "saw."
Therefore, "ed" does not have an independent meaning like a suffix would. It simply indicates that the verb is in the past tense.