English verb conjugation
MAY ASCERTAIN

Regular verb: ascertain - ascertained - ascertained

Affirmation

Simple form	V-ing form
I may ascertain you may ascertain he may ascertain we may ascertain you may ascertain they may ascertain	I may be ascertaining you may be ascertaining he may be ascertaining we may be ascertaining you may be ascertaining they may be ascertaining
Perfect	V-ing perfect
I may have ascertained you may have ascertained he may have ascertained we may have ascertained you may have ascertained they may have ascertained	I may have been ascertaining you may have been ascertaining he may have been ascertaining we may have been ascertaining you may have been ascertaining they may have been ascertaining

Negation

Simple form	V-ing form
I mayn't ascertain you mayn't ascertain he mayn't ascertain we mayn't ascertain you mayn't ascertain they mayn't ascertain	I mayn't be ascertaining you mayn't be ascertaining he mayn't be ascertaining we mayn't be ascertaining you mayn't be ascertaining they mayn't be ascertaining
Perfect	V-ing perfect
I mayn't have ascertained you mayn't have ascertained he mayn't have ascertained we mayn't have ascertained you mayn't have ascertained they mayn't have ascertained	I mayn't have been ascertaining you mayn't have been ascertaining he mayn't have been ascertaining we mayn't have been ascertaining you mayn't have been ascertaining they mayn't have been ascertaining

Interrogative form

Simple form	V-ing form
may I ascertain? may you ascertain? may he ascertain? may we ascertain? may you ascertain? may they ascertain?	may I be ascertaining? may you be ascertaining? may he be ascertaining? may we be ascertaining? may you be ascertaining? may they be ascertaining?
Perfect	V-ing perfect
may I have ascertained? may you have ascertained? may he have ascertained? may we have ascertained? may you have ascertained? may they have ascertained?	may I have been ascertaining? may you have been ascertaining? may he have been ascertaining? may we have been ascertaining? may you have been ascertaining? may they have been ascertaining?

Interro-negative form

Simple form	V-ing form
mayn't I ascertain? mayn't you ascertain? mayn't he ascertain? mayn't we ascertain? mayn't you ascertain? mayn't they ascertain?	mayn't I be ascertaining? mayn't you be ascertaining? mayn't he be ascertaining? mayn't we be ascertaining? mayn't you be ascertaining? mayn't they be ascertaining?
Perfect	V-ing perfect
mayn't I have ascertained? mayn't you have ascertained? mayn't he have ascertained? mayn't we have ascertained? mayn't you have ascertained? mayn't they have ascertained?	mayn't I have been ascertaining? mayn't you have been ascertaining? mayn't he have been ascertaining? mayn't we have been ascertaining? mayn't you have been ascertaining? mayn't they have been ascertaining?