must impugn
Verbo regular: impugn - impugned- impugned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must impugn
you must impugn
he must impugn
we must impugn
you must impugn
they must impugn 	I must be impugning
you must be impugning
he must be impugning
we must be impugning
you must be impugning
they must be impugning	I must have impugned
you must have impugned
he must have impugned
we must have impugned
you must have impugned
they must have impugned	I must have been impugning
you must have been impugning
he must have been impugning
we must have been impugning
you must have been impugning
they must have been impugning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not impugn
you must not impugn
he must not impugn
we must not impugn
you must not impugn
they must not impugn 	I must not be impugning
you must not be impugning
he must not be impugning
we must not be impugning
you must not be impugning
they must not be impugning	I must not have impugned
you must not have impugned
he must not have impugned
we must not have impugned
you must not have impugned
they must not have impugned	I must not have been impugning
you must not have been impugning
he must not have been impugning
we must not have been impugning
you must not have been impugning
they must not have been impugning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I impugn?
must you impugn?
must he impugn?
must we impugn?
must you impugn?
must they impugn? 	must I be impugning?
must you be impugning?
must he be impugning?
must we be impugning?
must you be impugning?
must they be impugning? 	must I have impugned?
must you have impugned?
must he have impugned?
must we have impugned?
must you have impugned?
must they have impugned? 	must I have been impugning?
must you have been impugning?
must he have been impugning?
must we have been impugning?
must you have been impugning?
must they have been impugning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not impugn?
must you not impugn?
must he not impugn?
must we not impugn?
must you not impugn?
must they not impugn? 	must I not be impugning?
must you not be impugning?
must he not be impugning?
must we not be impugning?
must you not be impugning?
must they not be impugning? 	must I not have impugned?
must you not have impugned?
must he not have impugned?
must we not have impugned?
must you not have impugned?
must they not have impugned? 	must I not have been impugning?
must you not have been impugning?
must he not have been impugning?
must we not have been impugning?
must you not have been impugning?
must they not have been impugning?