Here are the rules:
* If the verb ends in a consonant, simply add "-ed":
* walk -> walked
* jump -> jumped
* play -> played
* If the verb ends in a vowel followed by a consonant, double the consonant and add "-ed":
* stop -> stopped
* plan -> planned
* shop -> shopped
* If the verb ends in -e, simply add "-d":
* like -> liked
* smile -> smiled
* love -> loved
Examples:
* I walked to the store.
* She jumped over the fence.
* They played soccer in the park.
* He stopped the car.
* We planned a trip to the beach.
* The dog loved to play fetch.
Exceptions:
* Some verbs are irregular and don't follow these rules. They have unique past tense forms. For example:
* go -> went
* see -> saw
* eat -> ate
* have -> had
Let me know if you'd like more examples or want to learn about irregular verbs!