The document provides an overview of the present perfect tense in English including its form, uses, and comparison to the simple past tense. Key points include:
- The present perfect tense is formed using have/has + past participle and is used to describe actions that began in the past and continue to the present or where the time is unspecified.
- It can indicate recent events, lifetime experiences, actions over a period of time (using "for" and "since"), and indefinite time.
- Words like "already", "yet", "ever", and "never" are used specifically with the present perfect.
- The simple past tense is used to talk about completed actions at a specific time in the past
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