I may invoice you may invoice he may invoice we may invoice you may invoice they may invoice
V-ing form
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
I may have invoiced you may have invoiced he may have invoiced we may have invoiced you may have invoiced they may have invoiced
V-ing perfect
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
I mayn't invoice you mayn't invoice he mayn't invoice we mayn't invoice you mayn't invoice they mayn't invoice
V-ing form
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
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
V-ing perfect
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
may I invoice? may you invoice? may he invoice? may we invoice? may you invoice? may they invoice?
V-ing form
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
may I have invoiced? may you have invoiced? may he have invoiced? may we have invoiced? may you have invoiced? may they have invoiced?
V-ing perfect
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
mayn't I invoice? mayn't you invoice? mayn't he invoice? mayn't we invoice? mayn't you invoice? mayn't they invoice?
V-ing form
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
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?
V-ing perfect
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?