English verb conjugation
COULD DETER

Regular verb: deter - detered - detered

Affirmation

Simple form	V-ing form
I could deter you could deter she could deter we could deter you could deter they could deter	I could be detering you could be detering she could be detering we could be detering you could be detering they could be detering
Perfect	V-ing perfect
I could have detered you could have detered she could have detered we could have detered you could have detered they could have detered	I could have been detering you could have been detering she could have been detering we could have been detering you could have been detering they could have been detering

Negation

Simple form	V-ing form
I could not deter you could not deter she could not deter we could not deter you could not deter they could not deter	I could not be detering you could not be detering she could not be detering we could not be detering you could not be detering they could not be detering
Perfect	V-ing perfect
I could not have detered you could not have detered she could not have detered we could not have detered you could not have detered they could not have detered	I could not have been detering you could not have been detering she could not have been detering we could not have been detering you could not have been detering they could not have been detering

Interrogative form

Simple form	V-ing form
could I deter? could you deter? could she deter? could we deter? could you deter? could they deter?	could I be detering? could you be detering? could she be detering? could we be detering? could you be detering? could they be detering?
Perfect	V-ing perfect
could I have detered? could you have detered? could she have detered? could we have detered? could you have detered? could they have detered?	could I have been detering? could you have been detering? could she have been detering? could we have been detering? could you have been detering? could they have been detering?

Interro-negative form

Simple form	V-ing form
could I not deter? could you not deter? could she not deter? could we not deter? could you not deter? could they not deter?	could I not be detering? could you not be detering? could she not be detering? could we not be detering? could you not be detering? could they not be detering?
Perfect	V-ing perfect
could I not have detered? could you not have detered? could she not have detered? could we not have detered? could you not have detered? could they not have detered?	could I not have been detering? could you not have been detering? could she not have been detering? could we not have been detering? could you not have been detering? could they not have been detering?