I've left my book at school. I can't do my homework now. - Something that happened in the recent past and its results affect the present., A new restaurant has opened near the cinema. - something that happened in the past, but we do not mention when., She has worked in this shop since 1997. - A state that began in the past and continues up to the present. , We've been on a hot air balloon flight. - Our experience, something we have or have not done.,

Present perfect rules and its examples

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