can grind
Verbo irregular: grind - ground- ground

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can grind
you can grind
she can grind
we can grind
you can grind
they can grind 	I can be grinding
you can be grinding
she can be grinding
we can be grinding
you can be grinding
they can be grinding	I can have ground
you can have ground
she can have ground
we can have ground
you can have ground
they can have ground	I can have been grinding
you can have been grinding
she can have been grinding
we can have been grinding
you can have been grinding
they can have been grinding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot grind
you cannot grind
she cannot grind
we cannot grind
you cannot grind
they cannot grind 	I cannot be grinding
you cannot be grinding
she cannot be grinding
we cannot be grinding
you cannot be grinding
they cannot be grinding	I cannot have ground
you cannot have ground
she cannot have ground
we cannot have ground
you cannot have ground
they cannot have ground	I cannot have been grinding
you cannot have been grinding
she cannot have been grinding
we cannot have been grinding
you cannot have been grinding
they cannot have been grinding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I grind?
can you grind?
can she grind?
can we grind?
can you grind?
can they grind? 	can I be grinding?
can you be grinding?
can she be grinding?
can we be grinding?
can you be grinding?
can they be grinding? 	can I have ground?
can you have ground?
can she have ground?
can we have ground?
can you have ground?
can they have ground? 	can I have been grinding?
can you have been grinding?
can she have been grinding?
can we have been grinding?
can you have been grinding?
can they have been grinding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not grind?
can you not grind?
can she not grind?
can we not grind?
can you not grind?
can they not grind? 	can I not be grinding?
can you not be grinding?
can she not be grinding?
can we not be grinding?
can you not be grinding?
can they not be grinding? 	can I not have ground?
can you not have ground?
can she not have ground?
can we not have ground?
can you not have ground?
can they not have ground? 	can I not have been grinding?
can you not have been grinding?
can she not have been grinding?
can we not have been grinding?
can you not have been grinding?
can they not have been grinding?