La narración en el pasado: cómo se combinan el pretérito y el imperfecto (1)

1			a complete action that took place in the past
			A)	preterite
			B)	imperfect
2			usual actions in the past
			A)	preterite
			B)	imperfect
3			description in the past
			A)	preterite
			B)	imperfect
4			the beginning or end of an action
			A)	preterite
			B)	imperfect
5			sudden changes in the past
			A)	preterite
			B)	imperfect
6			description of an action in the past as it was happening
			A)	preterite
			B)	imperfect