can countermine
Regular verb: countermine - countermined- countermined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can countermine
you can countermine
he can countermine
we can countermine
you can countermine
they can countermine 	I can be countermining
you can be countermining
he can be countermining
we can be countermining
you can be countermining
they can be countermining	I can have countermined
you can have countermined
he can have countermined
we can have countermined
you can have countermined
they can have countermined	I can have been countermining
you can have been countermining
he can have been countermining
we can have been countermining
you can have been countermining
they can have been countermining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot countermine
you cannot countermine
he cannot countermine
we cannot countermine
you cannot countermine
they cannot countermine 	I cannot be countermining
you cannot be countermining
he cannot be countermining
we cannot be countermining
you cannot be countermining
they cannot be countermining	I cannot have countermined
you cannot have countermined
he cannot have countermined
we cannot have countermined
you cannot have countermined
they cannot have countermined	I cannot have been countermining
you cannot have been countermining
he cannot have been countermining
we cannot have been countermining
you cannot have been countermining
they cannot have been countermining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I countermine?
can you countermine?
can he countermine?
can we countermine?
can you countermine?
can they countermine? 	can I be countermining?
can you be countermining?
can he be countermining?
can we be countermining?
can you be countermining?
can they be countermining? 	can I have countermined?
can you have countermined?
can he have countermined?
can we have countermined?
can you have countermined?
can they have countermined? 	can I have been countermining?
can you have been countermining?
can he have been countermining?
can we have been countermining?
can you have been countermining?
can they have been countermining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not countermine?
can you not countermine?
can he not countermine?
can we not countermine?
can you not countermine?
can they not countermine? 	can I not be countermining?
can you not be countermining?
can he not be countermining?
can we not be countermining?
can you not be countermining?
can they not be countermining? 	can I not have countermined?
can you not have countermined?
can he not have countermined?
can we not have countermined?
can you not have countermined?
can they not have countermined? 	can I not have been countermining?
can you not have been countermining?
can he not have been countermining?
can we not have been countermining?
can you not have been countermining?
can they not have been countermining?