English verb conjugation
SHOULD ASCERTAIN

Regular verb: ascertain - ascertained - ascertained

Affirmation

Simple form	V-ing form
I should ascertain you should ascertain she should ascertain we should ascertain you should ascertain they should ascertain	I should be ascertaining you should be ascertaining she should be ascertaining we should be ascertaining you should be ascertaining they should be ascertaining
Perfect	V-ing perfect
I should have ascertained you should have ascertained she should have ascertained we should have ascertained you should have ascertained they should have ascertained	I should have been ascertaining you should have been ascertaining she should have been ascertaining we should have been ascertaining you should have been ascertaining they should have been ascertaining

Negation

Simple form	V-ing form
I should not ascertain you should not ascertain she should not ascertain we should not ascertain you should not ascertain they should not ascertain	I should not be ascertaining you should not be ascertaining she should not be ascertaining we should not be ascertaining you should not be ascertaining they should not be ascertaining
Perfect	V-ing perfect
I should not have ascertained you should not have ascertained she should not have ascertained we should not have ascertained you should not have ascertained they should not have ascertained	I should not have been ascertaining you should not have been ascertaining she should not have been ascertaining we should not have been ascertaining you should not have been ascertaining they should not have been ascertaining

Interrogative form

Simple form	V-ing form
should I ascertain? should you ascertain? should she ascertain? should we ascertain? should you ascertain? should they ascertain?	should I be ascertaining? should you be ascertaining? should she be ascertaining? should we be ascertaining? should you be ascertaining? should they be ascertaining?
Perfect	V-ing perfect
should I have ascertained? should you have ascertained? should she have ascertained? should we have ascertained? should you have ascertained? should they have ascertained?	should I have been ascertaining? should you have been ascertaining? should she have been ascertaining? should we have been ascertaining? should you have been ascertaining? should they have been ascertaining?

Interro-negative form

Simple form	V-ing form
should I not ascertain? should you not ascertain? should she not ascertain? should we not ascertain? should you not ascertain? should they not ascertain?	should I not be ascertaining? should you not be ascertaining? should she not be ascertaining? should we not be ascertaining? should you not be ascertaining? should they not be ascertaining?
Perfect	V-ing perfect
should I not have ascertained? should you not have ascertained? should she not have ascertained? should we not have ascertained? should you not have ascertained? should they not have ascertained?	should I not have been ascertaining? should you not have been ascertaining? should she not have been ascertaining? should we not have been ascertaining? should you not have been ascertaining? should they not have been ascertaining?