could rollerblade
Verbo regular: rollerblade - rollerbladed- rollerbladed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could rollerblade
you could rollerblade
she could rollerblade
we could rollerblade
you could rollerblade
they could rollerblade 	I could be rollerblading
you could be rollerblading
she could be rollerblading
we could be rollerblading
you could be rollerblading
they could be rollerblading	I could have rollerbladed
you could have rollerbladed
she could have rollerbladed
we could have rollerbladed
you could have rollerbladed
they could have rollerbladed	I could have been rollerblading
you could have been rollerblading
she could have been rollerblading
we could have been rollerblading
you could have been rollerblading
they could have been rollerblading	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not rollerblade
you could not rollerblade
she could not rollerblade
we could not rollerblade
you could not rollerblade
they could not rollerblade 	I could not be rollerblading
you could not be rollerblading
she could not be rollerblading
we could not be rollerblading
you could not be rollerblading
they could not be rollerblading	I could not have rollerbladed
you could not have rollerbladed
she could not have rollerbladed
we could not have rollerbladed
you could not have rollerbladed
they could not have rollerbladed	I could not have been rollerblading
you could not have been rollerblading
she could not have been rollerblading
we could not have been rollerblading
you could not have been rollerblading
they could not have been rollerblading	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I rollerblade?
could you rollerblade?
could she rollerblade?
could we rollerblade?
could you rollerblade?
could they rollerblade? 	could I be rollerblading?
could you be rollerblading?
could she be rollerblading?
could we be rollerblading?
could you be rollerblading?
could they be rollerblading? 	could I have rollerbladed?
could you have rollerbladed?
could she have rollerbladed?
could we have rollerbladed?
could you have rollerbladed?
could they have rollerbladed? 	could I have been rollerblading?
could you have been rollerblading?
could she have been rollerblading?
could we have been rollerblading?
could you have been rollerblading?
could they have been rollerblading? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not rollerblade?
could you not rollerblade?
could she not rollerblade?
could we not rollerblade?
could you not rollerblade?
could they not rollerblade? 	could I not be rollerblading?
could you not be rollerblading?
could she not be rollerblading?
could we not be rollerblading?
could you not be rollerblading?
could they not be rollerblading? 	could I not have rollerbladed?
could you not have rollerbladed?
could she not have rollerbladed?
could we not have rollerbladed?
could you not have rollerbladed?
could they not have rollerbladed? 	could I not have been rollerblading?
could you not have been rollerblading?
could she not have been rollerblading?
could we not have been rollerblading?
could you not have been rollerblading?
could they not have been rollerblading?