Conjugación del verbo inglés
CAN IMPUGN

Verbo regular: impugn - impugned - impugned

Afirmación

Forma simple	Forma con V-ing
I can impugn you can impugn she can impugn we can impugn you can impugn they can impugn	I can be impugning you can be impugning she can be impugning we can be impugning you can be impugning they can be impugning
Perfecto	Perfecto con V-ing
I can have impugned you can have impugned she can have impugned we can have impugned you can have impugned they can have impugned	I can have been impugning you can have been impugning she can have been impugning we can have been impugning you can have been impugning they can have been impugning

Negación

Forma simple	Forma con V-ing
I can't impugn you can't impugn she can't impugn we can't impugn you can't impugn they can't impugn	I can't be impugning you can't be impugning she can't be impugning we can't be impugning you can't be impugning they can't be impugning
Perfecto	Perfecto con V-ing
I can't have impugned you can't have impugned she can't have impugned we can't have impugned you can't have impugned they can't have impugned	I can't have been impugning you can't have been impugning she can't have been impugning we can't have been impugning you can't have been impugning they can't have been impugning

Forma interrogativa

Forma simple	Forma con V-ing
can I impugn? can you impugn? can she impugn? can we impugn? can you impugn? can they impugn?	can I be impugning? can you be impugning? can she be impugning? can we be impugning? can you be impugning? can they be impugning?
Perfecto	Perfecto con V-ing
can I have impugned? can you have impugned? can she have impugned? can we have impugned? can you have impugned? can they have impugned?	can I have been impugning? can you have been impugning? can she have been impugning? can we have been impugning? can you have been impugning? can they have been impugning?

Forma interro-negativa

Forma simple	Forma con V-ing
can't I impugn? can't you impugn? can't she impugn? can't we impugn? can't you impugn? can't they impugn?	can't I be impugning? can't you be impugning? can't she be impugning? can't we be impugning? can't you be impugning? can't they be impugning?
Perfecto	Perfecto con V-ing
can't I have impugned? can't you have impugned? can't she have impugned? can't we have impugned? can't you have impugned? can't they have impugned?	can't I have been impugning? can't you have been impugning? can't she have been impugning? can't we have been impugning? can't you have been impugning? can't they have been impugning?