Answer:
The principal parts of a B. regular verb are formed by adding -ed, -d, or -t to the present part.
Step-by-step explanation:
An English verb can be either regular or irregular, according to their formation in the simple past and in the past participle. Regular verbs are formed by adding -ed, -d, or -to to the infinitive, while irregular verbs can end in a wide variety of ways with no consistent pattern.
Example of regular verb: start-started.
Example of irregular verb: feel-felt.