could rollerblade
Regular verb: rollerblade - rollerbladed- rollerbladed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rollerblade
you could rollerblade
he could rollerblade
we could rollerblade
you could rollerblade
they could rollerblade 	I could be rollerblading
you could be rollerblading
he could be rollerblading
we could be rollerblading
you could be rollerblading
they could be rollerblading	I could have rollerbladed
you could have rollerbladed
he 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
he could have been rollerblading
we could have been rollerblading
you could have been rollerblading
they could have been rollerblading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't rollerblade
you couldn't rollerblade
he couldn't rollerblade
we couldn't rollerblade
you couldn't rollerblade
they couldn't rollerblade 	I couldn't be rollerblading
you couldn't be rollerblading
he couldn't be rollerblading
we couldn't be rollerblading
you couldn't be rollerblading
they couldn't be rollerblading	I couldn't have rollerbladed
you couldn't have rollerbladed
he couldn't have rollerbladed
we couldn't have rollerbladed
you couldn't have rollerbladed
they couldn't have rollerbladed	I couldn't have been rollerblading
you couldn't have been rollerblading
he couldn't have been rollerblading
we couldn't have been rollerblading
you couldn't have been rollerblading
they couldn't have been rollerblading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rollerblade?
could you rollerblade?
could he rollerblade?
could we rollerblade?
could you rollerblade?
could they rollerblade? 	could I be rollerblading?
could you be rollerblading?
could he be rollerblading?
could we be rollerblading?
could you be rollerblading?
could they be rollerblading? 	could I have rollerbladed?
could you have rollerbladed?
could he 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 he have been rollerblading?
could we have been rollerblading?
could you have been rollerblading?
could they have been rollerblading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I rollerblade?
couldn't you rollerblade?
couldn't he rollerblade?
couldn't we rollerblade?
couldn't you rollerblade?
couldn't they rollerblade? 	couldn't I be rollerblading?
couldn't you be rollerblading?
couldn't he be rollerblading?
couldn't we be rollerblading?
couldn't you be rollerblading?
couldn't they be rollerblading? 	couldn't I have rollerbladed?
couldn't you have rollerbladed?
couldn't he have rollerbladed?
couldn't we have rollerbladed?
couldn't you have rollerbladed?
couldn't they have rollerbladed? 	couldn't I have been rollerblading?
couldn't you have been rollerblading?
couldn't he have been rollerblading?
couldn't we have been rollerblading?
couldn't you have been rollerblading?
couldn't they have been rollerblading?