must lumber
Verbo regular: lumber - lumbered- lumbered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must lumber
you must lumber
he must lumber
we must lumber
you must lumber
they must lumber 	I must be lumbering
you must be lumbering
he must be lumbering
we must be lumbering
you must be lumbering
they must be lumbering	I must have lumbered
you must have lumbered
he must have lumbered
we must have lumbered
you must have lumbered
they must have lumbered	I must have been lumbering
you must have been lumbering
he must have been lumbering
we must have been lumbering
you must have been lumbering
they must have been lumbering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't lumber
you mustn't lumber
he mustn't lumber
we mustn't lumber
you mustn't lumber
they mustn't lumber 	I mustn't be lumbering
you mustn't be lumbering
he mustn't be lumbering
we mustn't be lumbering
you mustn't be lumbering
they mustn't be lumbering	I mustn't have lumbered
you mustn't have lumbered
he mustn't have lumbered
we mustn't have lumbered
you mustn't have lumbered
they mustn't have lumbered	I mustn't have been lumbering
you mustn't have been lumbering
he mustn't have been lumbering
we mustn't have been lumbering
you mustn't have been lumbering
they mustn't have been lumbering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I lumber?
must you lumber?
must he lumber?
must we lumber?
must you lumber?
must they lumber? 	must I be lumbering?
must you be lumbering?
must he be lumbering?
must we be lumbering?
must you be lumbering?
must they be lumbering? 	must I have lumbered?
must you have lumbered?
must he have lumbered?
must we have lumbered?
must you have lumbered?
must they have lumbered? 	must I have been lumbering?
must you have been lumbering?
must he have been lumbering?
must we have been lumbering?
must you have been lumbering?
must they have been lumbering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I lumber?
mustn't you lumber?
mustn't he lumber?
mustn't we lumber?
mustn't you lumber?
mustn't they lumber? 	mustn't I be lumbering?
mustn't you be lumbering?
mustn't he be lumbering?
mustn't we be lumbering?
mustn't you be lumbering?
mustn't they be lumbering? 	mustn't I have lumbered?
mustn't you have lumbered?
mustn't he have lumbered?
mustn't we have lumbered?
mustn't you have lumbered?
mustn't they have lumbered? 	mustn't I have been lumbering?
mustn't you have been lumbering?
mustn't he have been lumbering?
mustn't we have been lumbering?
mustn't you have been lumbering?
mustn't they have been lumbering?