English verb conjugation
SHOULD PREASCERTAIN

Regular verb: preascertain - preascertained - preascertained

Affirmation

Simple form	V-ing form
I'd preascertain you'd preascertain she'd preascertain we'd preascertain you'd preascertain they'd preascertain	I'd be preascertaining you'd be preascertaining she'd be preascertaining we'd be preascertaining you'd be preascertaining they'd be preascertaining
Perfect	V-ing perfect
I should've preascertained you should've preascertained she should've preascertained we should've preascertained you should've preascertained they should've preascertained	I should've been preascertaining you should've been preascertaining she should've been preascertaining we should've been preascertaining you should've been preascertaining they should've been preascertaining

Negation

Simple form	V-ing form
I shouldn't preascertain you shouldn't preascertain she shouldn't preascertain we shouldn't preascertain you shouldn't preascertain they shouldn't preascertain	I shouldn't be preascertaining you shouldn't be preascertaining she shouldn't be preascertaining we shouldn't be preascertaining you shouldn't be preascertaining they shouldn't be preascertaining
Perfect	V-ing perfect
I shouldn't have preascertained you shouldn't have preascertained she shouldn't have preascertained we shouldn't have preascertained you shouldn't have preascertained they shouldn't have preascertained	I shouldn't have been preascertaining you shouldn't have been preascertaining she shouldn't have been preascertaining we shouldn't have been preascertaining you shouldn't have been preascertaining they shouldn't have been preascertaining

Interrogative form

Simple form	V-ing form
should I preascertain? should you preascertain? should she preascertain? should we preascertain? should you preascertain? should they preascertain?	should I be preascertaining? should you be preascertaining? should she 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 she 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 she 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
shouldn't I preascertain? shouldn't you preascertain? shouldn't she preascertain? shouldn't we preascertain? shouldn't you preascertain? shouldn't they preascertain?	shouldn't I be preascertaining? shouldn't you be preascertaining? shouldn't she be preascertaining? shouldn't we be preascertaining? shouldn't you be preascertaining? shouldn't they be preascertaining?
Perfect	V-ing perfect
shouldn't I have preascertained? shouldn't you have preascertained? shouldn't she have preascertained? shouldn't we have preascertained? shouldn't you have preascertained? shouldn't they have preascertained?	shouldn't I have been preascertaining? shouldn't you have been preascertaining? shouldn't she have been preascertaining? shouldn't we have been preascertaining? shouldn't you have been preascertaining? shouldn't they have been preascertaining?