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 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
Perfect	V-ing perfect
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
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
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?
Perfect	V-ing perfect
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?