I'd be preascertaining you'd be preascertaining he'd be preascertaining we'd be preascertaining you'd be preascertaining they'd be preascertaining
Perfect
I should've preascertained you should've preascertained he should've preascertained we should've preascertained you should've preascertained they should've preascertained
Perfect en V-ing
I should've been preascertaining you should've been preascertaining he should've been preascertaining we should've been preascertaining you should've been preascertaining they should've been preascertaining
Négation
Forme simple
I shouldn't preascertain you shouldn't preascertain he shouldn't preascertain we shouldn't preascertain you shouldn't preascertain they shouldn't preascertain
Forme en V-ing
I shouldn't be preascertaining you shouldn't be preascertaining he shouldn't be preascertaining we shouldn't be preascertaining you shouldn't be preascertaining they shouldn't be preascertaining
Perfect
I shouldn't have preascertained you shouldn't have preascertained he shouldn't have preascertained we shouldn't have preascertained you shouldn't have preascertained they shouldn't have preascertained
Perfect en V-ing
I shouldn't have been preascertaining you shouldn't have been preascertaining he shouldn't have been preascertaining we shouldn't have been preascertaining you shouldn't have been preascertaining they shouldn't have been preascertaining
Forme interrogative
Forme simple
should I preascertain? should you preascertain? should he preascertain? should we preascertain? should you preascertain? should they preascertain?
Forme en V-ing
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
should I have preascertained? should you have preascertained? should he have preascertained? should we have preascertained? should you have preascertained? should they have preascertained?
Perfect en V-ing
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?
Forme interro-négative
Forme simple
shouldn't I preascertain? shouldn't you preascertain? shouldn't he preascertain? shouldn't we preascertain? shouldn't you preascertain? shouldn't they preascertain?
Forme en V-ing
shouldn't I be preascertaining? shouldn't you be preascertaining? shouldn't he be preascertaining? shouldn't we be preascertaining? shouldn't you be preascertaining? shouldn't they be preascertaining?
Perfect
shouldn't I have preascertained? shouldn't you have preascertained? shouldn't he have preascertained? shouldn't we have preascertained? shouldn't you have preascertained? shouldn't they have preascertained?
Perfect en V-ing
shouldn't I have been preascertaining? shouldn't you have been preascertaining? shouldn't he have been preascertaining? shouldn't we have been preascertaining? shouldn't you have been preascertaining? shouldn't they have been preascertaining?