Petr Juna Why is used in second sentence present perfect if person who saying this talking about future. After the subordinator 'when' (and other subordinating conjunctions of time), the present tense is taken to mean the future, and the present perfect is taken to mean the past of the future. I will help you when I am ready.
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Petr JunaWhy is used in second sentence present perfect if person who saying this talking about future.After the subordinator 'when' (and other subordinating conjunctions of time), the present tense is taken to mean the future, and the present perfect is taken to mean the past of the future.