I could swirl you could swirl he could swirl we could swirl you could swirl they could swirl
V-ing form
I could be swirling you could be swirling he could be swirling we could be swirling you could be swirling they could be swirling
Perfect
I could have swirled you could have swirled he could have swirled we could have swirled you could have swirled they could have swirled
V-ing perfect
I could have been swirling you could have been swirling he could have been swirling we could have been swirling you could have been swirling they could have been swirling
Negation
Simple form
I could not swirl you could not swirl he could not swirl we could not swirl you could not swirl they could not swirl
V-ing form
I could not be swirling you could not be swirling he could not be swirling we could not be swirling you could not be swirling they could not be swirling
Perfect
I could not have swirled you could not have swirled he could not have swirled we could not have swirled you could not have swirled they could not have swirled
V-ing perfect
I could not have been swirling you could not have been swirling he could not have been swirling we could not have been swirling you could not have been swirling they could not have been swirling
Interrogative form
Simple form
could I swirl? could you swirl? could he swirl? could we swirl? could you swirl? could they swirl?
V-ing form
could I be swirling? could you be swirling? could he be swirling? could we be swirling? could you be swirling? could they be swirling?
Perfect
could I have swirled? could you have swirled? could he have swirled? could we have swirled? could you have swirled? could they have swirled?
V-ing perfect
could I have been swirling? could you have been swirling? could he have been swirling? could we have been swirling? could you have been swirling? could they have been swirling?
Interro-negative form
Simple form
could I not swirl? could you not swirl? could he not swirl? could we not swirl? could you not swirl? could they not swirl?
V-ing form
could I not be swirling? could you not be swirling? could he not be swirling? could we not be swirling? could you not be swirling? could they not be swirling?
Perfect
could I not have swirled? could you not have swirled? could he not have swirled? could we not have swirled? could you not have swirled? could they not have swirled?
V-ing perfect
could I not have been swirling? could you not have been swirling? could he not have been swirling? could we not have been swirling? could you not have been swirling? could they not have been swirling?