1. Verb Tense
Tense denotes the time of the action indicated by a verb. The time is not always the same as that indicated by the name of the tense.

2. Present Tense
Present tense may express action which is going on at the present time or which occurs always, repeatedly, or habitually.
Examples: He sees the train. He eats cereal for breakfast every day.

3. Past Tense
Past tense expresses action completed at a definite time in the past.
Examples: He wrote the letter yesterday. She lived to be 90 years old.

4. Future Tense
Future tense expresses action which will take place in the future.
It uses the helping verbs will or could and the present tense form of the verb.
Examples: He will send the letter tomorrow. I could wait here until you return.

5. Verb Forms

6. Regular Verbs
Regular verbs form their past tense by adding –ed or –d to their present tense form.
More than 95% of all English verbs are regular.
Regular verbs cause few problems in speaking and writing.

7. Regular Verbs Present Tense Present Participle Past Tense
Principal Parts:
Verb:
Present Tense
Present Participle
Past Tense
Past Participle
To call
call, calls
calling
called
(have) called
To dust
dust, dusts
dusting
dusted
(have) dusted

8. Irregular Verbs
Irregular verbs can form their past tense and past participle forms in various way.
These forms cause even native speakers innumerable problems.
The most irregular verb of all is the verb to be.
Another irregular verb that is important for its use with other verbs is the verb to have.

9. Four Principal/Main Parts
Principal Parts:
Verb:
Present Tense
Present Participle
Past Tense
Past Participle
To Be
be, am, are, is
being
was, were
(have) been
To Have
have, has
having
had
(have) had

10. Other Common Irregular Verbs
Principal Part
Verb
Present Tense
Present Participle
Past Tense
Past Participle
To see
see, sees
seeing
saw
(have) seen
To do
do, does
doing
did
(have) done
To fly
fly, flies
flying
flew
(have) flown
To run
run, runs
running
ran
(have) run

11. Conjugation
A conjugation of a verb is the correct arrangement of its form through its tenses, persons, and numbers.
Person means the speaker, the person spoken to, and the person or thing spoken of.
Number means singular or plural.