I'd be guessing you'd be guessing he'd be guessing we'd be guessing you'd be guessing they'd be guessing
Perfect
I should've guessed you should've guessed he should've guessed we should've guessed you should've guessed they should've guessed
V-ing perfect
I should've been guessing you should've been guessing he should've been guessing we should've been guessing you should've been guessing they should've been guessing
Negation
Simple form
I shouldn't guess you shouldn't guess he shouldn't guess we shouldn't guess you shouldn't guess they shouldn't guess
V-ing form
I shouldn't be guessing you shouldn't be guessing he shouldn't be guessing we shouldn't be guessing you shouldn't be guessing they shouldn't be guessing
Perfect
I shouldn't have guessed you shouldn't have guessed he shouldn't have guessed we shouldn't have guessed you shouldn't have guessed they shouldn't have guessed
V-ing perfect
I shouldn't have been guessing you shouldn't have been guessing he shouldn't have been guessing we shouldn't have been guessing you shouldn't have been guessing they shouldn't have been guessing
Interrogative form
Simple form
should I guess? should you guess? should he guess? should we guess? should you guess? should they guess?
V-ing form
should I be guessing? should you be guessing? should he be guessing? should we be guessing? should you be guessing? should they be guessing?
Perfect
should I have guessed? should you have guessed? should he have guessed? should we have guessed? should you have guessed? should they have guessed?
V-ing perfect
should I have been guessing? should you have been guessing? should he have been guessing? should we have been guessing? should you have been guessing? should they have been guessing?
Interro-negative form
Simple form
shouldn't I guess? shouldn't you guess? shouldn't he guess? shouldn't we guess? shouldn't you guess? shouldn't they guess?
V-ing form
shouldn't I be guessing? shouldn't you be guessing? shouldn't he be guessing? shouldn't we be guessing? shouldn't you be guessing? shouldn't they be guessing?
Perfect
shouldn't I have guessed? shouldn't you have guessed? shouldn't he have guessed? shouldn't we have guessed? shouldn't you have guessed? shouldn't they have guessed?
V-ing perfect
shouldn't I have been guessing? shouldn't you have been guessing? shouldn't he have been guessing? shouldn't we have been guessing? shouldn't you have been guessing? shouldn't they have been guessing?