I could pan you could pan he could pan we could pan you could pan they could pan
V-ing form
I could be panning you could be panning he could be panning we could be panning you could be panning they could be panning
Perfect
I could have panned you could have panned he could have panned we could have panned you could have panned they could have panned
V-ing perfect
I could have been panning you could have been panning he could have been panning we could have been panning you could have been panning they could have been panning
Negation
Simple form
I could not pan you could not pan he could not pan we could not pan you could not pan they could not pan
V-ing form
I could not be panning you could not be panning he could not be panning we could not be panning you could not be panning they could not be panning
Perfect
I could not have panned you could not have panned he could not have panned we could not have panned you could not have panned they could not have panned
V-ing perfect
I could not have been panning you could not have been panning he could not have been panning we could not have been panning you could not have been panning they could not have been panning
Interrogative form
Simple form
could I pan? could you pan? could he pan? could we pan? could you pan? could they pan?
V-ing form
could I be panning? could you be panning? could he be panning? could we be panning? could you be panning? could they be panning?
Perfect
could I have panned? could you have panned? could he have panned? could we have panned? could you have panned? could they have panned?
V-ing perfect
could I have been panning? could you have been panning? could he have been panning? could we have been panning? could you have been panning? could they have been panning?
Interro-negative form
Simple form
could I not pan? could you not pan? could he not pan? could we not pan? could you not pan? could they not pan?
V-ing form
could I not be panning? could you not be panning? could he not be panning? could we not be panning? could you not be panning? could they not be panning?
Perfect
could I not have panned? could you not have panned? could he not have panned? could we not have panned? could you not have panned? could they not have panned?
V-ing perfect
could I not have been panning? could you not have been panning? could he not have been panning? could we not have been panning? could you not have been panning? could they not have been panning?