could roller-skate
Verbo regolare: roller-skate - roller-skated- roller-skated

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could roller-skate
you could roller-skate
she could roller-skate
we could roller-skate
you could roller-skate
they could roller-skate 	I could be roller-skating
you could be roller-skating
she could be roller-skating
we could be roller-skating
you could be roller-skating
they could be roller-skating	I could have roller-skated
you could have roller-skated
she could have roller-skated
we could have roller-skated
you could have roller-skated
they could have roller-skated	I could have been roller-skating
you could have been roller-skating
she could have been roller-skating
we could have been roller-skating
you could have been roller-skating
they could have been roller-skating	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not roller-skate
you could not roller-skate
she could not roller-skate
we could not roller-skate
you could not roller-skate
they could not roller-skate 	I could not be roller-skating
you could not be roller-skating
she could not be roller-skating
we could not be roller-skating
you could not be roller-skating
they could not be roller-skating	I could not have roller-skated
you could not have roller-skated
she could not have roller-skated
we could not have roller-skated
you could not have roller-skated
they could not have roller-skated	I could not have been roller-skating
you could not have been roller-skating
she could not have been roller-skating
we could not have been roller-skating
you could not have been roller-skating
they could not have been roller-skating	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I roller-skate?
could you roller-skate?
could she roller-skate?
could we roller-skate?
could you roller-skate?
could they roller-skate? 	could I be roller-skating?
could you be roller-skating?
could she be roller-skating?
could we be roller-skating?
could you be roller-skating?
could they be roller-skating? 	could I have roller-skated?
could you have roller-skated?
could she have roller-skated?
could we have roller-skated?
could you have roller-skated?
could they have roller-skated? 	could I have been roller-skating?
could you have been roller-skating?
could she have been roller-skating?
could we have been roller-skating?
could you have been roller-skating?
could they have been roller-skating? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not roller-skate?
could you not roller-skate?
could she not roller-skate?
could we not roller-skate?
could you not roller-skate?
could they not roller-skate? 	could I not be roller-skating?
could you not be roller-skating?
could she not be roller-skating?
could we not be roller-skating?
could you not be roller-skating?
could they not be roller-skating? 	could I not have roller-skated?
could you not have roller-skated?
could she not have roller-skated?
could we not have roller-skated?
could you not have roller-skated?
could they not have roller-skated? 	could I not have been roller-skating?
could you not have been roller-skating?
could she not have been roller-skating?
could we not have been roller-skating?
could you not have been roller-skating?
could they not have been roller-skating?