I'd be undertaining you'd be undertaining he'd be undertaining we'd be undertaining you'd be undertaining they'd be undertaining
Perfect
I should've undertained you should've undertained he should've undertained we should've undertained you should've undertained they should've undertained
V-ing perfect
I should've been undertaining you should've been undertaining he should've been undertaining we should've been undertaining you should've been undertaining they should've been undertaining
Negation
Simple form
I shouldn't undertain you shouldn't undertain he shouldn't undertain we shouldn't undertain you shouldn't undertain they shouldn't undertain
V-ing form
I shouldn't be undertaining you shouldn't be undertaining he shouldn't be undertaining we shouldn't be undertaining you shouldn't be undertaining they shouldn't be undertaining
Perfect
I shouldn't have undertained you shouldn't have undertained he shouldn't have undertained we shouldn't have undertained you shouldn't have undertained they shouldn't have undertained
V-ing perfect
I shouldn't have been undertaining you shouldn't have been undertaining he shouldn't have been undertaining we shouldn't have been undertaining you shouldn't have been undertaining they shouldn't have been undertaining
Interrogative form
Simple form
should I undertain? should you undertain? should he undertain? should we undertain? should you undertain? should they undertain?
V-ing form
should I be undertaining? should you be undertaining? should he be undertaining? should we be undertaining? should you be undertaining? should they be undertaining?
Perfect
should I have undertained? should you have undertained? should he have undertained? should we have undertained? should you have undertained? should they have undertained?
V-ing perfect
should I have been undertaining? should you have been undertaining? should he have been undertaining? should we have been undertaining? should you have been undertaining? should they have been undertaining?
Interro-negative form
Simple form
shouldn't I undertain? shouldn't you undertain? shouldn't he undertain? shouldn't we undertain? shouldn't you undertain? shouldn't they undertain?
V-ing form
shouldn't I be undertaining? shouldn't you be undertaining? shouldn't he be undertaining? shouldn't we be undertaining? shouldn't you be undertaining? shouldn't they be undertaining?
Perfect
shouldn't I have undertained? shouldn't you have undertained? shouldn't he have undertained? shouldn't we have undertained? shouldn't you have undertained? shouldn't they have undertained?
V-ing perfect
shouldn't I have been undertaining? shouldn't you have been undertaining? shouldn't he have been undertaining? shouldn't we have been undertaining? shouldn't you have been undertaining? shouldn't they have been undertaining?