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 can't countermine
you can't countermine
he can't countermine
we can't countermine
you can't countermine
they can't countermine 	I can't be countermining
you can't be countermining
he can't be countermining
we can't be countermining
you can't be countermining
they can't be countermining	I can't have countermined
you can't have countermined
he can't have countermined
we can't have countermined
you can't have countermined
they can't have countermined	I can't have been countermining
you can't have been countermining
he can't have been countermining
we can't have been countermining
you can't have been countermining
they can't 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't I countermine?
can't you countermine?
can't he countermine?
can't we countermine?
can't you countermine?
can't they countermine? 	can't I be countermining?
can't you be countermining?
can't he be countermining?
can't we be countermining?
can't you be countermining?
can't they be countermining? 	can't I have countermined?
can't you have countermined?
can't he have countermined?
can't we have countermined?
can't you have countermined?
can't they have countermined? 	can't I have been countermining?
can't you have been countermining?
can't he have been countermining?
can't we have been countermining?
can't you have been countermining?
can't they have been countermining?