I'd be fooling you'd be fooling she'd be fooling we'd be fooling you'd be fooling they'd be fooling
Perfect
I should've fooled you should've fooled she should've fooled we should've fooled you should've fooled they should've fooled
V-ing perfect
I should've been fooling you should've been fooling she should've been fooling we should've been fooling you should've been fooling they should've been fooling
Negation
Simple form
I shouldn't fool you shouldn't fool she shouldn't fool we shouldn't fool you shouldn't fool they shouldn't fool
V-ing form
I shouldn't be fooling you shouldn't be fooling she shouldn't be fooling we shouldn't be fooling you shouldn't be fooling they shouldn't be fooling
Perfect
I shouldn't have fooled you shouldn't have fooled she shouldn't have fooled we shouldn't have fooled you shouldn't have fooled they shouldn't have fooled
V-ing perfect
I shouldn't have been fooling you shouldn't have been fooling she shouldn't have been fooling we shouldn't have been fooling you shouldn't have been fooling they shouldn't have been fooling
Interrogative form
Simple form
should I fool? should you fool? should she fool? should we fool? should you fool? should they fool?
V-ing form
should I be fooling? should you be fooling? should she be fooling? should we be fooling? should you be fooling? should they be fooling?
Perfect
should I have fooled? should you have fooled? should she have fooled? should we have fooled? should you have fooled? should they have fooled?
V-ing perfect
should I have been fooling? should you have been fooling? should she have been fooling? should we have been fooling? should you have been fooling? should they have been fooling?
Interro-negative form
Simple form
shouldn't I fool? shouldn't you fool? shouldn't she fool? shouldn't we fool? shouldn't you fool? shouldn't they fool?
V-ing form
shouldn't I be fooling? shouldn't you be fooling? shouldn't she be fooling? shouldn't we be fooling? shouldn't you be fooling? shouldn't they be fooling?
Perfect
shouldn't I have fooled? shouldn't you have fooled? shouldn't she have fooled? shouldn't we have fooled? shouldn't you have fooled? shouldn't they have fooled?
V-ing perfect
shouldn't I have been fooling? shouldn't you have been fooling? shouldn't she have been fooling? shouldn't we have been fooling? shouldn't you have been fooling? shouldn't they have been fooling?