I could freshen you could freshen he could freshen we could freshen you could freshen they could freshen
V-ing form
I could be freshening you could be freshening he could be freshening we could be freshening you could be freshening they could be freshening
Perfect
I could have freshened you could have freshened he could have freshened we could have freshened you could have freshened they could have freshened
V-ing perfect
I could have been freshening you could have been freshening he could have been freshening we could have been freshening you could have been freshening they could have been freshening
Negation
Simple form
I could not freshen you could not freshen he could not freshen we could not freshen you could not freshen they could not freshen
V-ing form
I could not be freshening you could not be freshening he could not be freshening we could not be freshening you could not be freshening they could not be freshening
Perfect
I could not have freshened you could not have freshened he could not have freshened we could not have freshened you could not have freshened they could not have freshened
V-ing perfect
I could not have been freshening you could not have been freshening he could not have been freshening we could not have been freshening you could not have been freshening they could not have been freshening
Interrogative form
Simple form
could I freshen? could you freshen? could he freshen? could we freshen? could you freshen? could they freshen?
V-ing form
could I be freshening? could you be freshening? could he be freshening? could we be freshening? could you be freshening? could they be freshening?
Perfect
could I have freshened? could you have freshened? could he have freshened? could we have freshened? could you have freshened? could they have freshened?
V-ing perfect
could I have been freshening? could you have been freshening? could he have been freshening? could we have been freshening? could you have been freshening? could they have been freshening?
Interro-negative form
Simple form
could I not freshen? could you not freshen? could he not freshen? could we not freshen? could you not freshen? could they not freshen?
V-ing form
could I not be freshening? could you not be freshening? could he not be freshening? could we not be freshening? could you not be freshening? could they not be freshening?
Perfect
could I not have freshened? could you not have freshened? could he not have freshened? could we not have freshened? could you not have freshened? could they not have freshened?
V-ing perfect
could I not have been freshening? could you not have been freshening? could he not have been freshening? could we not have been freshening? could you not have been freshening? could they not have been freshening?