The imperfect form in Italian, imperfetto, is an important tense, as it is used to describe events that happened in the past. The imperfect tense is used for three different occasions:
1. An on-going action in the past that is interrupted by another event
Example: Mentre finivo il libro, è arrivata la mia amica. (While I was finishing the book, my friend arrived)
2. A repeated action in the past
Example: Quando ero piccolo, andavo spesso al mare. (When I was young, I went to the sea often)
3. Two or more events that happened simultaneously in the past
Example: Mentre lavoravo, Matteo dormiva. (While I was working, Matthew was sleeping)