can counter
Regular verb: counter - countered- countered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?