I could profess you could profess he could profess we could profess you could profess they could profess
V-ing form
I could be professing you could be professing he could be professing we could be professing you could be professing they could be professing
Perfect
I could have professed you could have professed he could have professed we could have professed you could have professed they could have professed
V-ing perfect
I could have been professing you could have been professing he could have been professing we could have been professing you could have been professing they could have been professing
Negation
Simple form
I could not profess you could not profess he could not profess we could not profess you could not profess they could not profess
V-ing form
I could not be professing you could not be professing he could not be professing we could not be professing you could not be professing they could not be professing
Perfect
I could not have professed you could not have professed he could not have professed we could not have professed you could not have professed they could not have professed
V-ing perfect
I could not have been professing you could not have been professing he could not have been professing we could not have been professing you could not have been professing they could not have been professing
Interrogative form
Simple form
could I profess? could you profess? could he profess? could we profess? could you profess? could they profess?
V-ing form
could I be professing? could you be professing? could he be professing? could we be professing? could you be professing? could they be professing?
Perfect
could I have professed? could you have professed? could he have professed? could we have professed? could you have professed? could they have professed?
V-ing perfect
could I have been professing? could you have been professing? could he have been professing? could we have been professing? could you have been professing? could they have been professing?
Interro-negative form
Simple form
could I not profess? could you not profess? could he not profess? could we not profess? could you not profess? could they not profess?
V-ing form
could I not be professing? could you not be professing? could he not be professing? could we not be professing? could you not be professing? could they not be professing?
Perfect
could I not have professed? could you not have professed? could he not have professed? could we not have professed? could you not have professed? could they not have professed?
V-ing perfect
could I not have been professing? could you not have been professing? could he not have been professing? could we not have been professing? could you not have been professing? could they not have been professing?