must board
Verbo regular: board - boarded- boarded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must board
you must board
she must board
we must board
you must board
they must board 	I must be boarding
you must be boarding
she must be boarding
we must be boarding
you must be boarding
they must be boarding	I must have boarded
you must have boarded
she must have boarded
we must have boarded
you must have boarded
they must have boarded	I must have been boarding
you must have been boarding
she must have been boarding
we must have been boarding
you must have been boarding
they must have been boarding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not board
you must not board
she must not board
we must not board
you must not board
they must not board 	I must not be boarding
you must not be boarding
she must not be boarding
we must not be boarding
you must not be boarding
they must not be boarding	I must not have boarded
you must not have boarded
she must not have boarded
we must not have boarded
you must not have boarded
they must not have boarded	I must not have been boarding
you must not have been boarding
she must not have been boarding
we must not have been boarding
you must not have been boarding
they must not have been boarding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I board?
must you board?
must she board?
must we board?
must you board?
must they board? 	must I be boarding?
must you be boarding?
must she be boarding?
must we be boarding?
must you be boarding?
must they be boarding? 	must I have boarded?
must you have boarded?
must she have boarded?
must we have boarded?
must you have boarded?
must they have boarded? 	must I have been boarding?
must you have been boarding?
must she have been boarding?
must we have been boarding?
must you have been boarding?
must they have been boarding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not board?
must you not board?
must she not board?
must we not board?
must you not board?
must they not board? 	must I not be boarding?
must you not be boarding?
must she not be boarding?
must we not be boarding?
must you not be boarding?
must they not be boarding? 	must I not have boarded?
must you not have boarded?
must she not have boarded?
must we not have boarded?
must you not have boarded?
must they not have boarded? 	must I not have been boarding?
must you not have been boarding?
must she not have been boarding?
must we not have been boarding?
must you not have been boarding?
must they not have been boarding?