This document describes the 8 main verb tenses in English:
1) Present Simple - describes habits, routines, or general facts and can express opinions. It uses time expressions like always, often, never, etc.
2) Past Simple - describes completed actions or situations that occurred at a specific time in the past. It uses time expressions like yesterday, last week, etc.
3) Present Continuous - describes activities that are happening now or plans for the future. It uses time expressions like now, today, these days, etc.
4) Present Perfect - has different meanings like describing actions that occurred at an unspecified time in the past or repeated past actions. It uses time expressions like already, just