must counteract
Regular verb: counteract - counteracted- counteracted

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not counteract
you must not counteract
he must not counteract
we must not counteract
you must not counteract
they must not counteract 	I must not be counteracting
you must not be counteracting
he must not be counteracting
we must not be counteracting
you must not be counteracting
they must not be counteracting	I must not have counteracted
you must not have counteracted
he must not have counteracted
we must not have counteracted
you must not have counteracted
they must not have counteracted	I must not have been counteracting
you must not have been counteracting
he must not have been counteracting
we must not have been counteracting
you must not have been counteracting
they must not have been counteracting	

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

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