English verb conjugation
MAY ASCERTAIN

Regular verb: ascertain - ascertained - ascertained

Affirmation

Simple form	V-ing form
I may ascertain you may ascertain she may ascertain we may ascertain you may ascertain they may ascertain	I may be ascertaining you may be ascertaining she 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 she 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 she 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 she 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 she 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 she 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 she 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 she ascertain? may we ascertain? may you ascertain? may they ascertain?	may I be ascertaining? may you be ascertaining? may she 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 she 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 she 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 she 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 she 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 she 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 she have been ascertaining? mayn't we have been ascertaining? mayn't you have been ascertaining? mayn't they have been ascertaining?