must invoice
Verbo regular: invoice - invoiced- invoiced

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must invoice
you must invoice
he must invoice
we must invoice
you must invoice
they must invoice 	I must be invoicing
you must be invoicing
he must be invoicing
we must be invoicing
you must be invoicing
they must be invoicing	I must have invoiced
you must have invoiced
he must have invoiced
we must have invoiced
you must have invoiced
they must have invoiced	I must have been invoicing
you must have been invoicing
he must have been invoicing
we must have been invoicing
you must have been invoicing
they must have been invoicing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not invoice
you must not invoice
he must not invoice
we must not invoice
you must not invoice
they must not invoice 	I must not be invoicing
you must not be invoicing
he must not be invoicing
we must not be invoicing
you must not be invoicing
they must not be invoicing	I must not have invoiced
you must not have invoiced
he must not have invoiced
we must not have invoiced
you must not have invoiced
they must not have invoiced	I must not have been invoicing
you must not have been invoicing
he must not have been invoicing
we must not have been invoicing
you must not have been invoicing
they must not have been invoicing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I invoice?
must you invoice?
must he invoice?
must we invoice?
must you invoice?
must they invoice? 	must I be invoicing?
must you be invoicing?
must he be invoicing?
must we be invoicing?
must you be invoicing?
must they be invoicing? 	must I have invoiced?
must you have invoiced?
must he have invoiced?
must we have invoiced?
must you have invoiced?
must they have invoiced? 	must I have been invoicing?
must you have been invoicing?
must he have been invoicing?
must we have been invoicing?
must you have been invoicing?
must they have been invoicing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not invoice?
must you not invoice?
must he not invoice?
must we not invoice?
must you not invoice?
must they not invoice? 	must I not be invoicing?
must you not be invoicing?
must he not be invoicing?
must we not be invoicing?
must you not be invoicing?
must they not be invoicing? 	must I not have invoiced?
must you not have invoiced?
must he not have invoiced?
must we not have invoiced?
must you not have invoiced?
must they not have invoiced? 	must I not have been invoicing?
must you not have been invoicing?
must he not have been invoicing?
must we not have been invoicing?
must you not have been invoicing?
must they not have been invoicing?