I may preascertain you may preascertain he may preascertain we may preascertain you may preascertain they may preascertain
V-ing form
I may be preascertaining you may be preascertaining he may be preascertaining we may be preascertaining you may be preascertaining they may be preascertaining
Perfect
I may have preascertained you may have preascertained he may have preascertained we may have preascertained you may have preascertained they may have preascertained
V-ing perfect
I may have been preascertaining you may have been preascertaining he may have been preascertaining we may have been preascertaining you may have been preascertaining they may have been preascertaining
Negation
Simple form
I may not preascertain you may not preascertain he may not preascertain we may not preascertain you may not preascertain they may not preascertain
V-ing form
I may not be preascertaining you may not be preascertaining he may not be preascertaining we may not be preascertaining you may not be preascertaining they may not be preascertaining
Perfect
I may not have preascertained you may not have preascertained he may not have preascertained we may not have preascertained you may not have preascertained they may not have preascertained
V-ing perfect
I may not have been preascertaining you may not have been preascertaining he may not have been preascertaining we may not have been preascertaining you may not have been preascertaining they may not have been preascertaining
Interrogative form
Simple form
may I preascertain? may you preascertain? may he preascertain? may we preascertain? may you preascertain? may they preascertain?
V-ing form
may I be preascertaining? may you be preascertaining? may he be preascertaining? may we be preascertaining? may you be preascertaining? may they be preascertaining?
Perfect
may I have preascertained? may you have preascertained? may he have preascertained? may we have preascertained? may you have preascertained? may they have preascertained?
V-ing perfect
may I have been preascertaining? may you have been preascertaining? may he have been preascertaining? may we have been preascertaining? may you have been preascertaining? may they have been preascertaining?
Interro-negative form
Simple form
may I not preascertain? may you not preascertain? may he not preascertain? may we not preascertain? may you not preascertain? may they not preascertain?
V-ing form
may I not be preascertaining? may you not be preascertaining? may he not be preascertaining? may we not be preascertaining? may you not be preascertaining? may they not be preascertaining?
Perfect
may I not have preascertained? may you not have preascertained? may he not have preascertained? may we not have preascertained? may you not have preascertained? may they not have preascertained?
V-ing perfect
may I not have been preascertaining? may you not have been preascertaining? may he not have been preascertaining? may we not have been preascertaining? may you not have been preascertaining? may they not have been preascertaining?