I should participate you should participate she should participate we should participate you should participate they should participate
V-ing form
I should be participating you should be participating she should be participating we should be participating you should be participating they should be participating
Perfect
I should have participated you should have participated she should have participated we should have participated you should have participated they should have participated
V-ing perfect
I should have been participating you should have been participating she should have been participating we should have been participating you should have been participating they should have been participating
Negation
Simple form
I should not participate you should not participate she should not participate we should not participate you should not participate they should not participate
V-ing form
I should not be participating you should not be participating she should not be participating we should not be participating you should not be participating they should not be participating
Perfect
I should not have participated you should not have participated she should not have participated we should not have participated you should not have participated they should not have participated
V-ing perfect
I should not have been participating you should not have been participating she should not have been participating we should not have been participating you should not have been participating they should not 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
should I not participate? should you not participate? should she not participate? should we not participate? should you not participate? should they not participate?
V-ing form
should I not be participating? should you not be participating? should she not be participating? should we not be participating? should you not be participating? should they not be participating?
Perfect
should I not have participated? should you not have participated? should she not have participated? should we not have participated? should you not have participated? should they not have participated?
V-ing perfect
should I not have been participating? should you not have been participating? should she not have been participating? should we not have been participating? should you not have been participating? should they not have been participating?