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