must gain
Verbo regular: gain - gained- gained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must gain
you must gain
he must gain
we must gain
you must gain
they must gain 	I must be gaining
you must be gaining
he must be gaining
we must be gaining
you must be gaining
they must be gaining	I must have gained
you must have gained
he must have gained
we must have gained
you must have gained
they must have gained	I must have been gaining
you must have been gaining
he must have been gaining
we must have been gaining
you must have been gaining
they must have been gaining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't gain
you mustn't gain
he mustn't gain
we mustn't gain
you mustn't gain
they mustn't gain 	I mustn't be gaining
you mustn't be gaining
he mustn't be gaining
we mustn't be gaining
you mustn't be gaining
they mustn't be gaining	I mustn't have gained
you mustn't have gained
he mustn't have gained
we mustn't have gained
you mustn't have gained
they mustn't have gained	I mustn't have been gaining
you mustn't have been gaining
he mustn't have been gaining
we mustn't have been gaining
you mustn't have been gaining
they mustn't have been gaining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I gain?
must you gain?
must he gain?
must we gain?
must you gain?
must they gain? 	must I be gaining?
must you be gaining?
must he be gaining?
must we be gaining?
must you be gaining?
must they be gaining? 	must I have gained?
must you have gained?
must he have gained?
must we have gained?
must you have gained?
must they have gained? 	must I have been gaining?
must you have been gaining?
must he have been gaining?
must we have been gaining?
must you have been gaining?
must they have been gaining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I gain?
mustn't you gain?
mustn't he gain?
mustn't we gain?
mustn't you gain?
mustn't they gain? 	mustn't I be gaining?
mustn't you be gaining?
mustn't he be gaining?
mustn't we be gaining?
mustn't you be gaining?
mustn't they be gaining? 	mustn't I have gained?
mustn't you have gained?
mustn't he have gained?
mustn't we have gained?
mustn't you have gained?
mustn't they have gained? 	mustn't I have been gaining?
mustn't you have been gaining?
mustn't he have been gaining?
mustn't we have been gaining?
mustn't you have been gaining?
mustn't they have been gaining?