1. The Past Simple (Preterit) vs. The Present Perfect
In English, we often choose between two major tenses to talk about the past: the Past Simple and the Present Perfect. The choice depends on whether the time period is finished or unfinished, and whether the action has a connection to the present.
The Past Simple (Preterit) is used for actions completed ina finished time period. We often use specific time expressions such as yesterday, last week, in 1999, or two days ago. For example: “I watched television yesterday.” Regular verbs form the past by adding -ed (e.g., watch → watched). Irregular verbs do not follow this rule and must be memorized (e.g., go → went, see → saw).
Advanced Note: Time Expressions
Use ago with the Past Simple to show how long before now something happened: “He left 10 minutes ago.” Usefor with the Past Simple only if the period is finished: “I lived in London for 5 years (but I don’t live there now).”

