must undermine
Verbo regular: undermine - undermined- undermined

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must undermine
you must undermine
he must undermine
we must undermine
you must undermine
they must undermine 	I must be undermining
you must be undermining
he must be undermining
we must be undermining
you must be undermining
they must be undermining	I must have undermined
you must have undermined
he must have undermined
we must have undermined
you must have undermined
they must have undermined	I must have been undermining
you must have been undermining
he must have been undermining
we must have been undermining
you must have been undermining
they must have been undermining	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not undermine
you must not undermine
he must not undermine
we must not undermine
you must not undermine
they must not undermine 	I must not be undermining
you must not be undermining
he must not be undermining
we must not be undermining
you must not be undermining
they must not be undermining	I must not have undermined
you must not have undermined
he must not have undermined
we must not have undermined
you must not have undermined
they must not have undermined	I must not have been undermining
you must not have been undermining
he must not have been undermining
we must not have been undermining
you must not have been undermining
they must not have been undermining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I undermine?
must you undermine?
must he undermine?
must we undermine?
must you undermine?
must they undermine? 	must I be undermining?
must you be undermining?
must he be undermining?
must we be undermining?
must you be undermining?
must they be undermining? 	must I have undermined?
must you have undermined?
must he have undermined?
must we have undermined?
must you have undermined?
must they have undermined? 	must I have been undermining?
must you have been undermining?
must he have been undermining?
must we have been undermining?
must you have been undermining?
must they have been undermining? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not undermine?
must you not undermine?
must he not undermine?
must we not undermine?
must you not undermine?
must they not undermine? 	must I not be undermining?
must you not be undermining?
must he not be undermining?
must we not be undermining?
must you not be undermining?
must they not be undermining? 	must I not have undermined?
must you not have undermined?
must he not have undermined?
must we not have undermined?
must you not have undermined?
must they not have undermined? 	must I not have been undermining?
must you not have been undermining?
must he not have been undermining?
must we not have been undermining?
must you not have been undermining?
must they not have been undermining?