How does the simple past tense typically end?

The simple past tense in English is typically formed by adding "-d" or "-ed" to the base form of regular verbs. This transformation indicates that an action was completed in the past. For example, the verb “to walk” changes to “walked,” and “to play” changes to “played.” This subtle change not only marks the time of an action but also allows for clarity in communication about past events.

Other options provided are associated with different verb forms. The present tense often ends in "-s" or "-es," and the gerund or present participle form of a verb ends in "-ing." The "-en" ending is typically seen in the past participle form of certain irregular verbs but is not applicable to the formation of the simple past tense for most verbs. Hence, "-d" or "-ed" is the correct ending for the simple past tense.