I should excuse you should excuse she should excuse we should excuse you should excuse they should excuse
V-ing form
I should be excusing you should be excusing she should be excusing we should be excusing you should be excusing they should be excusing
Perfect
I should have excused you should have excused she should have excused we should have excused you should have excused they should have excused
V-ing perfect
I should have been excusing you should have been excusing she should have been excusing we should have been excusing you should have been excusing they should have been excusing
Negation
Simple form
I should not excuse you should not excuse she should not excuse we should not excuse you should not excuse they should not excuse
V-ing form
I should not be excusing you should not be excusing she should not be excusing we should not be excusing you should not be excusing they should not be excusing
Perfect
I should not have excused you should not have excused she should not have excused we should not have excused you should not have excused they should not have excused
V-ing perfect
I should not have been excusing you should not have been excusing she should not have been excusing we should not have been excusing you should not have been excusing they should not have been excusing
Interrogative form
Simple form
should I excuse? should you excuse? should she excuse? should we excuse? should you excuse? should they excuse?
V-ing form
should I be excusing? should you be excusing? should she be excusing? should we be excusing? should you be excusing? should they be excusing?
Perfect
should I have excused? should you have excused? should she have excused? should we have excused? should you have excused? should they have excused?
V-ing perfect
should I have been excusing? should you have been excusing? should she have been excusing? should we have been excusing? should you have been excusing? should they have been excusing?
Interro-negative form
Simple form
should I not excuse? should you not excuse? should she not excuse? should we not excuse? should you not excuse? should they not excuse?
V-ing form
should I not be excusing? should you not be excusing? should she not be excusing? should we not be excusing? should you not be excusing? should they not be excusing?
Perfect
should I not have excused? should you not have excused? should she not have excused? should we not have excused? should you not have excused? should they not have excused?
V-ing perfect
should I not have been excusing? should you not have been excusing? should she not have been excusing? should we not have been excusing? should you not have been excusing? should they not have been excusing?