can counter
Regular verb: counter - countered- countered

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