This document discusses the simple past tense in English. It explains that the simple past tense is used to refer to completed actions or situations in the past. For regular verbs, the past tense ending "-ed" is added without using "did", while irregular verbs do not follow a set pattern and must be learned. The simple past tense can be used to talk about specific or habitual past actions, indeterminate past actions, or past status. Common mistakes include using the present tense instead of the past tense and using "was" unnecessarily with past tense verbs.