Here's why:
* Generally, you add -ed to form the past tense and past participle of regular verbs. Examples:
* walk -> walked (past tense)
* walk -> walked (past participle)
* play -> played (past tense)
* play -> played (past participle)
* Exceptions:
* Verbs ending in -y preceded by a consonant: Change the y to i and add -ed. Example:
* cry -> cried
* Verbs ending in -e: Simply add -d. Example:
* love -> loved
Therefore, the statement is generally true, but you should be aware of these exceptions.