Remember, children: Present perfect is the third column of irregular verbs, e.g. go, went, gone; : "I have gone to school , he has done Maths, we haven´t hidden the cakes, she hasn´t fed the cat".
In regular verbs, it is verb+ed:"I have painted it, She has not finished yet", Bill Gates has invented the modern computers". In regular vebs there are not columns, it´s always ed
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