English verb conjugation
MAY INVOICE

Regular verb: invoice - invoiced - invoiced

Affirmation

Simple form	V-ing form
I may invoice you may invoice he may invoice we may invoice you may invoice they may invoice	I may be invoicing you may be invoicing he may be invoicing we may be invoicing you may be invoicing they may be invoicing
Perfect	V-ing perfect
I may have invoiced you may have invoiced he may have invoiced we may have invoiced you may have invoiced they may have invoiced	I may have been invoicing you may have been invoicing he may have been invoicing we may have been invoicing you may have been invoicing they may have been invoicing

Negation

Simple form	V-ing form
I mayn't invoice you mayn't invoice he mayn't invoice we mayn't invoice you mayn't invoice they mayn't invoice	I mayn't be invoicing you mayn't be invoicing he mayn't be invoicing we mayn't be invoicing you mayn't be invoicing they mayn't be invoicing
Perfect	V-ing perfect
I mayn't have invoiced you mayn't have invoiced he mayn't have invoiced we mayn't have invoiced you mayn't have invoiced they mayn't have invoiced	I mayn't have been invoicing you mayn't have been invoicing he mayn't have been invoicing we mayn't have been invoicing you mayn't have been invoicing they mayn't have been invoicing

Interrogative form

Simple form	V-ing form
may I invoice? may you invoice? may he invoice? may we invoice? may you invoice? may they invoice?	may I be invoicing? may you be invoicing? may he be invoicing? may we be invoicing? may you be invoicing? may they be invoicing?
Perfect	V-ing perfect
may I have invoiced? may you have invoiced? may he have invoiced? may we have invoiced? may you have invoiced? may they have invoiced?	may I have been invoicing? may you have been invoicing? may he have been invoicing? may we have been invoicing? may you have been invoicing? may they have been invoicing?

Interro-negative form

Simple form	V-ing form
mayn't I invoice? mayn't you invoice? mayn't he invoice? mayn't we invoice? mayn't you invoice? mayn't they invoice?	mayn't I be invoicing? mayn't you be invoicing? mayn't he be invoicing? mayn't we be invoicing? mayn't you be invoicing? mayn't they be invoicing?
Perfect	V-ing perfect
mayn't I have invoiced? mayn't you have invoiced? mayn't he have invoiced? mayn't we have invoiced? mayn't you have invoiced? mayn't they have invoiced?	mayn't I have been invoicing? mayn't you have been invoicing? mayn't he have been invoicing? mayn't we have been invoicing? mayn't you have been invoicing? mayn't they have been invoicing?