Student or Learner
I will never forget the earthquake that occurred in Italy. It occurred on April 6,2009.
Can we use "was" before occurred? If not, why?
We cannot because 'occur' is intransitive.
'Intransitive verb cannot be changed into passive voice
The sentences having intransitive verbs (belonging to any tense) cannot be changed into passive voice. The reason is that there is not any object in such sentences and without object of sentence passive voice is not possible.'── quoted from http://www.studyandexam.com/passive-...tive-verb.html
I am not a teacher.