The past simple is used to talk about actions in the past. In affirmative sentences, we use the structure “subject + V2/ed”, for example: “I watched TV yesterday.” For negative sentences, we use “subject + did not + base verb”, such as “She did not go to school.” In yes/no questions, the structure is “Did + subject + base verb?”, for example: “Did you watch TV?” For wh-questions, we use “Wh-word + did + subject + base verb?”, such as “Where did you go?” With the verb “to be”, we use “was” for I, he, she, it and “were” for you, we, they. Common time expressions like “yesterday”, “last night”, and “ago” are often used with the past simple.