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