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