must grind
Verbo irregular: grind - ground- ground

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must grind
you must grind
she must grind
we must grind
you must grind
they must grind 	I must be grinding
you must be grinding
she must be grinding
we must be grinding
you must be grinding
they must be grinding	I must have ground
you must have ground
she must have ground
we must have ground
you must have ground
they must have ground	I must have been grinding
you must have been grinding
she must have been grinding
we must have been grinding
you must have been grinding
they must have been grinding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't grind
you mustn't grind
she mustn't grind
we mustn't grind
you mustn't grind
they mustn't grind 	I mustn't be grinding
you mustn't be grinding
she mustn't be grinding
we mustn't be grinding
you mustn't be grinding
they mustn't be grinding	I mustn't have ground
you mustn't have ground
she mustn't have ground
we mustn't have ground
you mustn't have ground
they mustn't have ground	I mustn't have been grinding
you mustn't have been grinding
she mustn't have been grinding
we mustn't have been grinding
you mustn't have been grinding
they mustn't have been grinding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I grind?
must you grind?
must she grind?
must we grind?
must you grind?
must they grind? 	must I be grinding?
must you be grinding?
must she be grinding?
must we be grinding?
must you be grinding?
must they be grinding? 	must I have ground?
must you have ground?
must she have ground?
must we have ground?
must you have ground?
must they have ground? 	must I have been grinding?
must you have been grinding?
must she have been grinding?
must we have been grinding?
must you have been grinding?
must they have been grinding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I grind?
mustn't you grind?
mustn't she grind?
mustn't we grind?
mustn't you grind?
mustn't they grind? 	mustn't I be grinding?
mustn't you be grinding?
mustn't she be grinding?
mustn't we be grinding?
mustn't you be grinding?
mustn't they be grinding? 	mustn't I have ground?
mustn't you have ground?
mustn't she have ground?
mustn't we have ground?
mustn't you have ground?
mustn't they have ground? 	mustn't I have been grinding?
mustn't you have been grinding?
mustn't she have been grinding?
mustn't we have been grinding?
mustn't you have been grinding?
mustn't they have been grinding?