could counteract
Regular verb: counteract - counteracted- counteracted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could counteract
you could counteract
he could counteract
we could counteract
you could counteract
they could counteract 	I could be counteracting
you could be counteracting
he could be counteracting
we could be counteracting
you could be counteracting
they could be counteracting	I could have counteracted
you could have counteracted
he could have counteracted
we could have counteracted
you could have counteracted
they could have counteracted	I could have been counteracting
you could have been counteracting
he could have been counteracting
we could have been counteracting
you could have been counteracting
they could have been counteracting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't counteract
you couldn't counteract
he couldn't counteract
we couldn't counteract
you couldn't counteract
they couldn't counteract 	I couldn't be counteracting
you couldn't be counteracting
he couldn't be counteracting
we couldn't be counteracting
you couldn't be counteracting
they couldn't be counteracting	I couldn't have counteracted
you couldn't have counteracted
he couldn't have counteracted
we couldn't have counteracted
you couldn't have counteracted
they couldn't have counteracted	I couldn't have been counteracting
you couldn't have been counteracting
he couldn't have been counteracting
we couldn't have been counteracting
you couldn't have been counteracting
they couldn't have been counteracting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I counteract?
could you counteract?
could he counteract?
could we counteract?
could you counteract?
could they counteract? 	could I be counteracting?
could you be counteracting?
could he be counteracting?
could we be counteracting?
could you be counteracting?
could they be counteracting? 	could I have counteracted?
could you have counteracted?
could he have counteracted?
could we have counteracted?
could you have counteracted?
could they have counteracted? 	could I have been counteracting?
could you have been counteracting?
could he have been counteracting?
could we have been counteracting?
could you have been counteracting?
could they have been counteracting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I counteract?
couldn't you counteract?
couldn't he counteract?
couldn't we counteract?
couldn't you counteract?
couldn't they counteract? 	couldn't I be counteracting?
couldn't you be counteracting?
couldn't he be counteracting?
couldn't we be counteracting?
couldn't you be counteracting?
couldn't they be counteracting? 	couldn't I have counteracted?
couldn't you have counteracted?
couldn't he have counteracted?
couldn't we have counteracted?
couldn't you have counteracted?
couldn't they have counteracted? 	couldn't I have been counteracting?
couldn't you have been counteracting?
couldn't he have been counteracting?
couldn't we have been counteracting?
couldn't you have been counteracting?
couldn't they have been counteracting?