What is the past tense of crisis?

Answer 1

Crisis is a noun not a verb. You can say 'there was a crisis down at the shop' or 'Help, there is a crisis down at the shop.' Or future tense: 'little did they know there was going to be a crisis down at the shop.'

Answer 2

The past tense of "crisis" is "crises." The word "crisis" is a noun that follows the regular English pluralization rules, where the plural form is created by adding "-es" to the end of the word. Therefore, when referring to multiple crises that have occurred in the past, you would use the word "crises" as the plural form.