The document outlines the principal parts of regular verbs, irregular verbs, and the verb "to be" in English. For regular verbs, the present participle is formed by adding "-ing" to the base verb and the past tense and past participle are formed by adding "-ed". Irregular verbs have unique forms for the past tense and past participle that must be memorized. The verb "to be" also has its own conjugations for present, past, and past participle forms.

1. PRINCIPAL PARTS OF REGULAR VERBS
PRESENT PRESENT PAST PAST
PARTICIPLE PARTICIPLE
Rules Original verb am, is, are +verb verb +ed Has, have, had +
or +s +ing verb +ed
Example play or plays am, is , are played has, have, had
playing played
PRINCIPAL PARTS OF IRREGULAR VERBS
PRESENT PRESENT PAST PAST
PARTICIPLE PARTICIPLE
Rules Original verb am, is, are +verb Each one Has, have, had +
or +s +ing changes verb in past
different participle
Example write or am, is , are writting wrote has, have, had
writes written

2. PRINCIPAL PARTS OF THE VERB TO BE
PRESENT PAST PAST PARTICIPLE
am, is, are was, were (have, has, had) been