English verb conjugation
COULD ROLLERBLADE

Regular verb: rollerblade - rollerbladed - rollerbladed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not rollerblade you could not rollerblade he 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 he could not be rollerblading we could not be rollerblading you could not be rollerblading they could not be rollerblading
Perfect	V-ing perfect
I could not have rollerbladed you could not have rollerbladed he 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 he could not have been rollerblading we could not have been rollerblading you could not have been rollerblading they could not have been rollerblading

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not rollerblade? could you not rollerblade? could he 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 he not be rollerblading? could we not be rollerblading? could you not be rollerblading? could they not be rollerblading?
Perfect	V-ing perfect
could I not have rollerbladed? could you not have rollerbladed? could he 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 he not have been rollerblading? could we not have been rollerblading? could you not have been rollerblading? could they not have been rollerblading?