can undermine
Regular verb: undermine - undermined- undermined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can undermine
you can undermine
he can undermine
we can undermine
you can undermine
they can undermine 	I can be undermining
you can be undermining
he can be undermining
we can be undermining
you can be undermining
they can be undermining	I can have undermined
you can have undermined
he can have undermined
we can have undermined
you can have undermined
they can have undermined	I can have been undermining
you can have been undermining
he can have been undermining
we can have been undermining
you can have been undermining
they can have been undermining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot undermine
you cannot undermine
he cannot undermine
we cannot undermine
you cannot undermine
they cannot undermine 	I cannot be undermining
you cannot be undermining
he cannot be undermining
we cannot be undermining
you cannot be undermining
they cannot be undermining	I cannot have undermined
you cannot have undermined
he cannot have undermined
we cannot have undermined
you cannot have undermined
they cannot have undermined	I cannot have been undermining
you cannot have been undermining
he cannot have been undermining
we cannot have been undermining
you cannot have been undermining
they cannot have been undermining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I undermine?
can you undermine?
can he undermine?
can we undermine?
can you undermine?
can they undermine? 	can I be undermining?
can you be undermining?
can he be undermining?
can we be undermining?
can you be undermining?
can they be undermining? 	can I have undermined?
can you have undermined?
can he have undermined?
can we have undermined?
can you have undermined?
can they have undermined? 	can I have been undermining?
can you have been undermining?
can he have been undermining?
can we have been undermining?
can you have been undermining?
can they have been undermining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not undermine?
can you not undermine?
can he not undermine?
can we not undermine?
can you not undermine?
can they not undermine? 	can I not be undermining?
can you not be undermining?
can he not be undermining?
can we not be undermining?
can you not be undermining?
can they not be undermining? 	can I not have undermined?
can you not have undermined?
can he not have undermined?
can we not have undermined?
can you not have undermined?
can they not have undermined? 	can I not have been undermining?
can you not have been undermining?
can he not have been undermining?
can we not have been undermining?
can you not have been undermining?
can they not have been undermining?