English verb conjugation
SHOULD IMPUGN

Regular verb: impugn - impugned - impugned

Affirmation

Simple form	V-ing form
I should impugn you should impugn he should impugn we should impugn you should impugn they should impugn	I should be impugning you should be impugning he should be impugning we should be impugning you should be impugning they should be impugning
Perfect	V-ing perfect
I should have impugned you should have impugned he should have impugned we should have impugned you should have impugned they should have impugned	I should have been impugning you should have been impugning he should have been impugning we should have been impugning you should have been impugning they should have been impugning

Negation

Simple form	V-ing form
I should not impugn you should not impugn he should not impugn we should not impugn you should not impugn they should not impugn	I should not be impugning you should not be impugning he should not be impugning we should not be impugning you should not be impugning they should not be impugning
Perfect	V-ing perfect
I should not have impugned you should not have impugned he should not have impugned we should not have impugned you should not have impugned they should not have impugned	I should not have been impugning you should not have been impugning he should not have been impugning we should not have been impugning you should not have been impugning they should not have been impugning

Interrogative form

Simple form	V-ing form
should I impugn? should you impugn? should he impugn? should we impugn? should you impugn? should they impugn?	should I be impugning? should you be impugning? should he be impugning? should we be impugning? should you be impugning? should they be impugning?
Perfect	V-ing perfect
should I have impugned? should you have impugned? should he have impugned? should we have impugned? should you have impugned? should they have impugned?	should I have been impugning? should you have been impugning? should he have been impugning? should we have been impugning? should you have been impugning? should they have been impugning?

Interro-negative form

Simple form	V-ing form
should I not impugn? should you not impugn? should he not impugn? should we not impugn? should you not impugn? should they not impugn?	should I not be impugning? should you not be impugning? should he not be impugning? should we not be impugning? should you not be impugning? should they not be impugning?
Perfect	V-ing perfect
should I not have impugned? should you not have impugned? should he not have impugned? should we not have impugned? should you not have impugned? should they not have impugned?	should I not have been impugning? should you not have been impugning? should he not have been impugning? should we not have been impugning? should you not have been impugning? should they not have been impugning?