http://www.curso-ingles.com/gramatica-inglesa/present-perfect.php

• Afirmative clause / Frase afirmativa Sujeto + have/has + verbo en participio I have eaten (Yo he comido)

• Negative clause / Frase negativa Sujeto + have/has + not + verbo en participio I have not eaten (Yo no he comido)

• Interrogative clause/ Frase interrogativa Have/Has + sujeto + verbo en participio?Have I eaten? (¿He comido yo?)

Gramatical Structure / Estructura Gramatical (example with verb to eat)