El pasado irregular   The irregular past tense


                                                            hacer
 I did / made  
  hice  we did / made  
  hicimos
 you did / made (informal)   
 you did / made (formal) 		  hiciste
 hizo		  y'all did / made (informal) 
 y'all did / made (formal)  
  hicisteis
 hicieron
 he did / made  
 she did / made 
 it did / made   		  hizo
 
 		  they did / made  

  hicieron


                                                                    estar
 I was (somewhere)  
  estuve  we were (somewhere)  
  estuvimos
 you were (somewhere) (informal)   
 you were (somewhere) (formal) 		  estuviste
 estuvo		  y'all were (somewhere) (informal) 
 y'all were (somewhere) (formal)  
  estuvisteis
 estuvieron
 he was (somewhere)  
 she was (somewhere) 
 it was (somewhere)   		  estuvo
 
 		  they were (somewhere)  

  estuvieron


¿Qué hiciste ayer?  ¿Qué hiciste el fin de semana pasado? ¿Qué hiciste en las vacaciones?

Notice that when you ask about what a friend did yesterday, last weekend, and last summer, you use the verb hacer, which has an irrregular spelling in the past tense.

Several verbs have irregular spellings in the past tense.  What that means is that the stem of the verb (the part that usually does not change) has a different spelling than the original verb.  With hacer, it means that the hac- at the beginning changes to hic-.  

Notice that hacer and estar, above, use exactly the same endings, even though hacer is an -er verb, and estar is an -ar verb.
Almost all irregular verbs use the same 6 endings.  It doesn't matter if they are -ar, -er, or -ir verbs, they all use the endings below.  


Mira la lista de verbos irregulares en el pasado:

preterite stem  español  inglés
 anduv-  andar  to walk, to go
 estuv-  estar  to be somewhere, to be in a momentary state
 hic-  hacer  to make, to do
 pud-  poder  to be able to, can
 pus-  poner  to put 
 quis-  querer  to want (something) or to love (someone)
 sup-  saber  to know (in preterite means found out)
 tuv-  tener  to have (in preterite means got)
 vin-  venir  to come


There are three verbs that follow their own rules: ser, ir and dar.  The conjugations of each of these verbs is below.