English verb conjugation
COULD COUNTER

Regular verb: counter - countered - countered

Affirmation

Simple form	V-ing form
I could counter you could counter he could counter we could counter you could counter they could counter	I could be countering you could be countering he could be countering we could be countering you could be countering they could be countering
Perfect	V-ing perfect
I could have countered you could have countered he could have countered we could have countered you could have countered they could have countered	I could have been countering you could have been countering he could have been countering we could have been countering you could have been countering they could have been countering

Negation

Simple form	V-ing form
I could not counter you could not counter he could not counter we could not counter you could not counter they could not counter	I could not be countering you could not be countering he could not be countering we could not be countering you could not be countering they could not be countering
Perfect	V-ing perfect
I could not have countered you could not have countered he could not have countered we could not have countered you could not have countered they could not have countered	I could not have been countering you could not have been countering he could not have been countering we could not have been countering you could not have been countering they could not have been countering

Interrogative form

Simple form	V-ing form
could I counter? could you counter? could he counter? could we counter? could you counter? could they counter?	could I be countering? could you be countering? could he be countering? could we be countering? could you be countering? could they be countering?
Perfect	V-ing perfect
could I have countered? could you have countered? could he have countered? could we have countered? could you have countered? could they have countered?	could I have been countering? could you have been countering? could he have been countering? could we have been countering? could you have been countering? could they have been countering?

Interro-negative form

Simple form	V-ing form
could I not counter? could you not counter? could he not counter? could we not counter? could you not counter? could they not counter?	could I not be countering? could you not be countering? could he not be countering? could we not be countering? could you not be countering? could they not be countering?
Perfect	V-ing perfect
could I not have countered? could you not have countered? could he not have countered? could we not have countered? could you not have countered? could they not have countered?	could I not have been countering? could you not have been countering? could he not have been countering? could we not have been countering? could you not have been countering? could they not have been countering?