I could loosen you could loosen he could loosen we could loosen you could loosen they could loosen
V-ing form
I could be loosening you could be loosening he could be loosening we could be loosening you could be loosening they could be loosening
Perfect
I could have loosened you could have loosened he could have loosened we could have loosened you could have loosened they could have loosened
V-ing perfect
I could have been loosening you could have been loosening he could have been loosening we could have been loosening you could have been loosening they could have been loosening
Negation
Simple form
I could not loosen you could not loosen he could not loosen we could not loosen you could not loosen they could not loosen
V-ing form
I could not be loosening you could not be loosening he could not be loosening we could not be loosening you could not be loosening they could not be loosening
Perfect
I could not have loosened you could not have loosened he could not have loosened we could not have loosened you could not have loosened they could not have loosened
V-ing perfect
I could not have been loosening you could not have been loosening he could not have been loosening we could not have been loosening you could not have been loosening they could not have been loosening
Interrogative form
Simple form
could I loosen? could you loosen? could he loosen? could we loosen? could you loosen? could they loosen?
V-ing form
could I be loosening? could you be loosening? could he be loosening? could we be loosening? could you be loosening? could they be loosening?
Perfect
could I have loosened? could you have loosened? could he have loosened? could we have loosened? could you have loosened? could they have loosened?
V-ing perfect
could I have been loosening? could you have been loosening? could he have been loosening? could we have been loosening? could you have been loosening? could they have been loosening?
Interro-negative form
Simple form
could I not loosen? could you not loosen? could he not loosen? could we not loosen? could you not loosen? could they not loosen?
V-ing form
could I not be loosening? could you not be loosening? could he not be loosening? could we not be loosening? could you not be loosening? could they not be loosening?
Perfect
could I not have loosened? could you not have loosened? could he not have loosened? could we not have loosened? could you not have loosened? could they not have loosened?
V-ing perfect
could I not have been loosening? could you not have been loosening? could he not have been loosening? could we not have been loosening? could you not have been loosening? could they not have been loosening?