could grind
Verbo irregular: grind - ground- ground

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

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

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

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