I'd be participating you'd be participating he'd be participating we'd be participating you'd be participating they'd be participating
Perfect
I should've participated you should've participated he 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 he 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 he 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 he 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 he 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 he 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 he participate? should we participate? should you participate? should they participate?
V-ing form
should I be participating? should you be participating? should he be participating? should we be participating? should you be participating? should they be participating?
Perfect
should I have participated? should you have participated? should he 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 he 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 he 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 he 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 he 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 he have been participating? shouldn't we have been participating? shouldn't you have been participating? shouldn't they have been participating?