English verb conjugation
CAN PREASCERTAIN

Regular verb: preascertain - preascertained - preascertained

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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