must shield
Verbo regular: shield - shielded- shielded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must shield
you must shield
he must shield
we must shield
you must shield
they must shield 	I must be shielding
you must be shielding
he must be shielding
we must be shielding
you must be shielding
they must be shielding	I must have shielded
you must have shielded
he must have shielded
we must have shielded
you must have shielded
they must have shielded	I must have been shielding
you must have been shielding
he must have been shielding
we must have been shielding
you must have been shielding
they must have been shielding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't shield
you mustn't shield
he mustn't shield
we mustn't shield
you mustn't shield
they mustn't shield 	I mustn't be shielding
you mustn't be shielding
he mustn't be shielding
we mustn't be shielding
you mustn't be shielding
they mustn't be shielding	I mustn't have shielded
you mustn't have shielded
he mustn't have shielded
we mustn't have shielded
you mustn't have shielded
they mustn't have shielded	I mustn't have been shielding
you mustn't have been shielding
he mustn't have been shielding
we mustn't have been shielding
you mustn't have been shielding
they mustn't have been shielding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I shield?
must you shield?
must he shield?
must we shield?
must you shield?
must they shield? 	must I be shielding?
must you be shielding?
must he be shielding?
must we be shielding?
must you be shielding?
must they be shielding? 	must I have shielded?
must you have shielded?
must he have shielded?
must we have shielded?
must you have shielded?
must they have shielded? 	must I have been shielding?
must you have been shielding?
must he have been shielding?
must we have been shielding?
must you have been shielding?
must they have been shielding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I shield?
mustn't you shield?
mustn't he shield?
mustn't we shield?
mustn't you shield?
mustn't they shield? 	mustn't I be shielding?
mustn't you be shielding?
mustn't he be shielding?
mustn't we be shielding?
mustn't you be shielding?
mustn't they be shielding? 	mustn't I have shielded?
mustn't you have shielded?
mustn't he have shielded?
mustn't we have shielded?
mustn't you have shielded?
mustn't they have shielded? 	mustn't I have been shielding?
mustn't you have been shielding?
mustn't he have been shielding?
mustn't we have been shielding?
mustn't you have been shielding?
mustn't they have been shielding?