Present perfect: subject + has/have + verb (past participle), Finished actions, events or life experiences in the past (the time is not specified), Example: I've already sent the report., Actions or events that started in the past and have not finished., Example: We've manufactured this product for three years., Adverbs: just, already, yet, Past simple: subject + verb (past simple), Finished actions, events or life experiences in the past (the time is specified), Example: I sent the report last Friday., Actions and events that took place in a finished time period., Example: She worked here from five years, from 1999 to 2012., Time words: yesterday, last week, last year, in 2011, this morning, when I arrived, etc.,

B1: Present perfect vs Past simple

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