English verb conjugation
CAN COUNTER

Regular verb: counter - countered - countered

Affirmation

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

Negation

Simple form	V-ing form
I can't counter you can't counter he can't counter we can't counter you can't counter they can't counter	I can't be countering you can't be countering he can't be countering we can't be countering you can't be countering they can't be countering
Perfect	V-ing perfect
I can't have countered you can't have countered he can't have countered we can't have countered you can't have countered they can't have countered	I can't have been countering you can't have been countering he can't have been countering we can't have been countering you can't have been countering they can't have been countering

Interrogative form

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

Interro-negative form

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