English verb conjugation
MAY PURCHASE

Regular verb: purchase - purchased - purchased

Affirmation

Simple form	V-ing form
I may purchase you may purchase she may purchase we may purchase you may purchase they may purchase	I may be purchasing you may be purchasing she may be purchasing we may be purchasing you may be purchasing they may be purchasing
Perfect	V-ing perfect
I may have purchased you may have purchased she may have purchased we may have purchased you may have purchased they may have purchased	I may have been purchasing you may have been purchasing she may have been purchasing we may have been purchasing you may have been purchasing they may have been purchasing

Negation

Simple form	V-ing form
I mayn't purchase you mayn't purchase she mayn't purchase we mayn't purchase you mayn't purchase they mayn't purchase	I mayn't be purchasing you mayn't be purchasing she mayn't be purchasing we mayn't be purchasing you mayn't be purchasing they mayn't be purchasing
Perfect	V-ing perfect
I mayn't have purchased you mayn't have purchased she mayn't have purchased we mayn't have purchased you mayn't have purchased they mayn't have purchased	I mayn't have been purchasing you mayn't have been purchasing she mayn't have been purchasing we mayn't have been purchasing you mayn't have been purchasing they mayn't have been purchasing

Interrogative form

Simple form	V-ing form
may I purchase? may you purchase? may she purchase? may we purchase? may you purchase? may they purchase?	may I be purchasing? may you be purchasing? may she be purchasing? may we be purchasing? may you be purchasing? may they be purchasing?
Perfect	V-ing perfect
may I have purchased? may you have purchased? may she have purchased? may we have purchased? may you have purchased? may they have purchased?	may I have been purchasing? may you have been purchasing? may she have been purchasing? may we have been purchasing? may you have been purchasing? may they have been purchasing?

Interro-negative form

Simple form	V-ing form
mayn't I purchase? mayn't you purchase? mayn't she purchase? mayn't we purchase? mayn't you purchase? mayn't they purchase?	mayn't I be purchasing? mayn't you be purchasing? mayn't she be purchasing? mayn't we be purchasing? mayn't you be purchasing? mayn't they be purchasing?
Perfect	V-ing perfect
mayn't I have purchased? mayn't you have purchased? mayn't she have purchased? mayn't we have purchased? mayn't you have purchased? mayn't they have purchased?	mayn't I have been purchasing? mayn't you have been purchasing? mayn't she have been purchasing? mayn't we have been purchasing? mayn't you have been purchasing? mayn't they have been purchasing?