I should fester you should fester he should fester we should fester you should fester they should fester
V-ing form
I should be festering you should be festering he should be festering we should be festering you should be festering they should be festering
Perfect
I should have festered you should have festered he should have festered we should have festered you should have festered they should have festered
V-ing perfect
I should have been festering you should have been festering he should have been festering we should have been festering you should have been festering they should have been festering
Negation
Simple form
I should not fester you should not fester he should not fester we should not fester you should not fester they should not fester
V-ing form
I should not be festering you should not be festering he should not be festering we should not be festering you should not be festering they should not be festering
Perfect
I should not have festered you should not have festered he should not have festered we should not have festered you should not have festered they should not have festered
V-ing perfect
I should not have been festering you should not have been festering he should not have been festering we should not have been festering you should not have been festering they should not have been festering
Interrogative form
Simple form
should I fester? should you fester? should he fester? should we fester? should you fester? should they fester?
V-ing form
should I be festering? should you be festering? should he be festering? should we be festering? should you be festering? should they be festering?
Perfect
should I have festered? should you have festered? should he have festered? should we have festered? should you have festered? should they have festered?
V-ing perfect
should I have been festering? should you have been festering? should he have been festering? should we have been festering? should you have been festering? should they have been festering?
Interro-negative form
Simple form
should I not fester? should you not fester? should he not fester? should we not fester? should you not fester? should they not fester?
V-ing form
should I not be festering? should you not be festering? should he not be festering? should we not be festering? should you not be festering? should they not be festering?
Perfect
should I not have festered? should you not have festered? should he not have festered? should we not have festered? should you not have festered? should they not have festered?
V-ing perfect
should I not have been festering? should you not have been festering? should he not have been festering? should we not have been festering? should you not have been festering? should they not have been festering?