could flatten
Verbo regolare: flatten - flattened- flattened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could flatten
you could flatten
she could flatten
we could flatten
you could flatten
they could flatten 	I could be flattening
you could be flattening
she could be flattening
we could be flattening
you could be flattening
they could be flattening	I could have flattened
you could have flattened
she could have flattened
we could have flattened
you could have flattened
they could have flattened	I could have been flattening
you could have been flattening
she could have been flattening
we could have been flattening
you could have been flattening
they could have been flattening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not flatten
you could not flatten
she could not flatten
we could not flatten
you could not flatten
they could not flatten 	I could not be flattening
you could not be flattening
she could not be flattening
we could not be flattening
you could not be flattening
they could not be flattening	I could not have flattened
you could not have flattened
she could not have flattened
we could not have flattened
you could not have flattened
they could not have flattened	I could not have been flattening
you could not have been flattening
she could not have been flattening
we could not have been flattening
you could not have been flattening
they could not have been flattening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I flatten?
could you flatten?
could she flatten?
could we flatten?
could you flatten?
could they flatten? 	could I be flattening?
could you be flattening?
could she be flattening?
could we be flattening?
could you be flattening?
could they be flattening? 	could I have flattened?
could you have flattened?
could she have flattened?
could we have flattened?
could you have flattened?
could they have flattened? 	could I have been flattening?
could you have been flattening?
could she have been flattening?
could we have been flattening?
could you have been flattening?
could they have been flattening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not flatten?
could you not flatten?
could she not flatten?
could we not flatten?
could you not flatten?
could they not flatten? 	could I not be flattening?
could you not be flattening?
could she not be flattening?
could we not be flattening?
could you not be flattening?
could they not be flattening? 	could I not have flattened?
could you not have flattened?
could she not have flattened?
could we not have flattened?
could you not have flattened?
could they not have flattened? 	could I not have been flattening?
could you not have been flattening?
could she not have been flattening?
could we not have been flattening?
could you not have been flattening?
could they not have been flattening?