Como o verbo "have"p pode variar no "simple present"? explique e exemplifique

1.) Use the Present form of the Verb. 
You use this for Plural subjects. (that mean more than one). 
 
2.) Add s to present from of the Verb. 
You'll only do this when your subject is singular. (That means one). 
 
3.) Add es to present form of the verb 
You will only do this when your subject is and the Verb ends in s,z,x,sh, or ch.

Atahualpaemperor of the inca empire who rose to the throne after winning a civil war between him and his brother.  -he refused to become a spanish vassal or christian.-francisco pizarro kidnapped him and demanded a huge ransom.  -pizarro's secretary described him as "a man of thirty years, good-looking and poised, somewhat stout, with a wide, handsome, and ferocious face, and the eyes flaming with blood."-after the ransom was paid, atahualpa was killed by pizarro