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 couldn't counter you couldn't counter he couldn't counter we couldn't counter you couldn't counter they couldn't counter	I couldn't be countering you couldn't be countering he couldn't be countering we couldn't be countering you couldn't be countering they couldn't be countering
Perfect	V-ing perfect
I couldn't have countered you couldn't have countered he couldn't have countered we couldn't have countered you couldn't have countered they couldn't have countered	I couldn't have been countering you couldn't have been countering he couldn't have been countering we couldn't have been countering you couldn't have been countering they couldn't 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
couldn't I counter? couldn't you counter? couldn't he counter? couldn't we counter? couldn't you counter? couldn't they counter?	couldn't I be countering? couldn't you be countering? couldn't he be countering? couldn't we be countering? couldn't you be countering? couldn't they be countering?
Perfect	V-ing perfect
couldn't I have countered? couldn't you have countered? couldn't he have countered? couldn't we have countered? couldn't you have countered? couldn't they have countered?	couldn't I have been countering? couldn't you have been countering? couldn't he have been countering? couldn't we have been countering? couldn't you have been countering? couldn't they have been countering?