English verb conjugation
CAN COUNTER

Regular verb: counter - countered - countered

Affirmation

Simple form	V-ing form
I can counter you can counter she can counter we can counter you can counter they can counter	I can be countering you can be countering she 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 she 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 she 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 cannot counter you cannot counter she cannot counter we cannot counter you cannot counter they cannot counter	I cannot be countering you cannot be countering she cannot be countering we cannot be countering you cannot be countering they cannot be countering
Perfect	V-ing perfect
I cannot have countered you cannot have countered she cannot have countered we cannot have countered you cannot have countered they cannot have countered	I cannot have been countering you cannot have been countering she cannot have been countering we cannot have been countering you cannot have been countering they cannot have been countering

Interrogative form

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