The document discusses using the past tense in writing. It covers three main points:
1) Regular past tense verbs are formed by adding "-ed" to the base verb, following spelling rules. Irregular verbs have unique past tense forms that must be memorized.
2) "Was" and "were" are used as helping verbs with nouns and adjectives to talk about things/people/places in the past.
3) Negative sentences in the past use "didn't" with regular verbs and "was/were not" or "wasn't/weren't" with forms of "to be".