could rollerblade
Regular verb: rollerblade - rollerbladed- rollerbladed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't rollerblade
you couldn't rollerblade
she 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
she 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
she 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
she 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 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? 	

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