A verb mostly indicate an action. For instance something that people or things do or something that happens to them. John bought this shirt at Harrod's. This software is sold in all major department stores. The form of the verb changes when the tense is changed.
Most verbs are regular, but some verbs are irregular.
See also list of irregular verbs . A noun mostly refers to a person, animal, plant, thing, place or idea. The dictionary which we use is great. Twelve cars were sold this morning. Chris could not hide his sadness .