Review of Present perfect...and IRREGULAR VERBS !!

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