A verb expresses action or a state of being and tells (in active voice) what the subject of the clause is or does. A verb is necessary to make a complete statement.
All verbs are constructed from three basic forms known as the principal parts of a verb:
■ Infinitive (or present) is the base form of a verb, preceded by to: to run, to go, to laugh.
■ Past is the simplest form of a verb. Past is used to show action that has already taken place: ran, gone, laughed.
■ Past participle is the form a verb takes when it is accompanied by an auxiliary verb (helping verbs using forms of be, have, or do) to show a more complex past tense form: had gone, will have gone, would have laughed.

Active verbs (active voice) tell what the subject (a person, place, thing, or concept) does.
Example: The boy kicked the ball.
Passive verbs (passive voice) tell what is done to the subject.
Example: The ball was kicked by the boy.

A regular verb is used to form the past tense by adding a suffix –d or –ed
Example: hope, hoped, laugh, laughed

An irregular verb does not take the –d or –ed ending. The past tense for irregular verbs is formed by changing the verb internally. Refer to the Southeastern Writing Center’s handout Irregular Verbs for a list of the most commonly used irregular verb forms.
Example: run, ran, catch, caught

Verb tenses are used to show time. Verb tenses tell when events happen, happened, or will happen

The present tense may express an action that is repeated or ongoing. It can also express an action that is happening at this moment or a situation that is always true.
Example: Jane and Sarah jog every morning.

The past tense expresses an action that has already happened. In regular verbs, the past tense is formed by adding –ed or –d to the base form. In irregular verbs, the past tense takes a variety of forms.
Example: John and Sara hiked to the top of the mountain.

The future tense expresses an action that will take place in the future. The future tense is formed by adding will to the base form.
Example: I will fly to Atlanta Friday evening.

The present perfect tense is used to express an action that took place at some unspecified time in the past. The present perfect tense can also be used to express an action that began in the past and continues in the present. The present perfect tense is formed with the past tense of the verb and the helping verbs has or have.
Example: Sarah has watched the movie.

The past perfect tense is used to show that one action in the past began and ended before another action in the past started. The past perfect tense is formed with the past participle of the verb and the helping verb had.
Example: Sarah had seen the movie before I watched it.

The future perfect tense is used to show that one action or condition in the future will begin and end before another event in the future starts. The future perfect tense is formed with the past participle of the verb and the construction will have.
Example: By the time I finish this semester, I will have read ten novels.

The present progressive tense is used to show an ongoing event that is happening at the moment of speaking or writing. The present progressive tense is formed by using am, is, or are with the verb form ending in –ing.
Example: The children are sleeping.

The past progressive tense is used to show a past event that was happening when another event occurred. The past progressive tense is formed by using was or were with the verb form ending in –ing.
Example: The children were sleeping when we arrived.

The future progressive tense is used to show an ongoing or continuous event that will take place in the future. The future progressive tense is formed by using will be or shall be with the verb form ending in –ing.
Example: The children will be sleeping when we arrive.

The present perfect progressive tense is used to show an event that began in the past, continues in the present, and may continue in the future. The present perfect progressive tense is form by using has been or have been with the present participle verb form ending in –ing.
Example: The children have been sleeping

The past perfect progressive tense is used to show a past, ongoing event that was completed before another past event. The past perfect progressive tense is formed by using had been with the present perfect verb form ending in -ing.
Example: The children had been sleeping when we arrived.

The future perfect progressive tense is used to show a future, ongoing event that will happen before a specified future time. The future perfect progressive tense is formed by using will have been and the present participle verb form ending in –ing.
Example: The children will have been sleeping.