English verb conjugation
SHOULD PREASCERTAIN

Regular verb: preascertain - preascertained - preascertained

Affirmation

Simple form	V-ing form
I should preascertain you should preascertain he should preascertain we should preascertain you should preascertain they should preascertain	I should be preascertaining you should be preascertaining he should be preascertaining we should be preascertaining you should be preascertaining they should be preascertaining
Perfect	V-ing perfect
I should have preascertained you should have preascertained he should have preascertained we should have preascertained you should have preascertained they should have preascertained	I should have been preascertaining you should have been preascertaining he should have been preascertaining we should have been preascertaining you should have been preascertaining they should have been preascertaining

Negation

Simple form	V-ing form
I should not preascertain you should not preascertain he should not preascertain we should not preascertain you should not preascertain they should not preascertain	I should not be preascertaining you should not be preascertaining he should not be preascertaining we should not be preascertaining you should not be preascertaining they should not be preascertaining
Perfect	V-ing perfect
I should not have preascertained you should not have preascertained he should not have preascertained we should not have preascertained you should not have preascertained they should not have preascertained	I should not have been preascertaining you should not have been preascertaining he should not have been preascertaining we should not have been preascertaining you should not have been preascertaining they should not have been preascertaining

Interrogative form

Simple form	V-ing form
should I preascertain? should you preascertain? should he preascertain? should we preascertain? should you preascertain? should they preascertain?	should I be preascertaining? should you be preascertaining? should he be preascertaining? should we be preascertaining? should you be preascertaining? should they be preascertaining?
Perfect	V-ing perfect
should I have preascertained? should you have preascertained? should he have preascertained? should we have preascertained? should you have preascertained? should they have preascertained?	should I have been preascertaining? should you have been preascertaining? should he have been preascertaining? should we have been preascertaining? should you have been preascertaining? should they have been preascertaining?

Interro-negative form

Simple form	V-ing form
should I not preascertain? should you not preascertain? should he not preascertain? should we not preascertain? should you not preascertain? should they not preascertain?	should I not be preascertaining? should you not be preascertaining? should he not be preascertaining? should we not be preascertaining? should you not be preascertaining? should they not be preascertaining?
Perfect	V-ing perfect
should I not have preascertained? should you not have preascertained? should he not have preascertained? should we not have preascertained? should you not have preascertained? should they not have preascertained?	should I not have been preascertaining? should you not have been preascertaining? should he not have been preascertaining? should we not have been preascertaining? should you not have been preascertaining? should they not have been preascertaining?