Past Simple vs. Present Perfect

Past Simple vs Present Perfect Past Simple is used to talk about actions that happened at a specific time in the past. You often use time expressions like "yesterday," "last week," "in 2010," or "two days ago." The structure is: subject + past verb. Example: I visited my friend yesterday. Present Perfect is used to talk about actions that happened at an unspecified time in the past or actions that have a connection to the present. You often use time expressions like "ever," "never," "just," "already," or "yet." The structure is: subject + has/have + past participle. Example: I have visited my friend. Conditions for use: 1. Past Simple: - Used with specific time expressions: yesterday, last week, in 2010, two days ago, etc. - Used for completed actions with no connection to the present. - Used for actions that happened in a sequence. 2. Present Perfect: - Used with unspecific time expressions: ever, never, just, already, yet, since. - Used for actions that have relevance to the present or continue to the present. - Used for experiences or changes over time.