I'd be forbidding you'd be forbidding she'd be forbidding we'd be forbidding you'd be forbidding they'd be forbidding
Perfect
I should've forbid, forbidden you should've forbid, forbidden she should've forbid, forbidden we should've forbid, forbidden you should've forbid, forbidden they should've forbid, forbidden
V-ing perfect
I should've been forbidding you should've been forbidding she should've been forbidding we should've been forbidding you should've been forbidding they should've been forbidding
Negation
Simple form
I shouldn't forbid you shouldn't forbid she shouldn't forbid we shouldn't forbid you shouldn't forbid they shouldn't forbid
V-ing form
I shouldn't be forbidding you shouldn't be forbidding she shouldn't be forbidding we shouldn't be forbidding you shouldn't be forbidding they shouldn't be forbidding
Perfect
I shouldn't have forbid, forbidden you shouldn't have forbid, forbidden she shouldn't have forbid, forbidden we shouldn't have forbid, forbidden you shouldn't have forbid, forbidden they shouldn't have forbid, forbidden
V-ing perfect
I shouldn't have been forbidding you shouldn't have been forbidding she shouldn't have been forbidding we shouldn't have been forbidding you shouldn't have been forbidding they shouldn't have been forbidding
Interrogative form
Simple form
should I forbid? should you forbid? should she forbid? should we forbid? should you forbid? should they forbid?
V-ing form
should I be forbidding? should you be forbidding? should she be forbidding? should we be forbidding? should you be forbidding? should they be forbidding?
Perfect
should I have forbid, forbidden? should you have forbid, forbidden? should she have forbid, forbidden? should we have forbid, forbidden? should you have forbid, forbidden? should they have forbid, forbidden?
V-ing perfect
should I have been forbidding? should you have been forbidding? should she have been forbidding? should we have been forbidding? should you have been forbidding? should they have been forbidding?
Interro-negative form
Simple form
shouldn't I forbid? shouldn't you forbid? shouldn't she forbid? shouldn't we forbid? shouldn't you forbid? shouldn't they forbid?
V-ing form
shouldn't I be forbidding? shouldn't you be forbidding? shouldn't she be forbidding? shouldn't we be forbidding? shouldn't you be forbidding? shouldn't they be forbidding?
Perfect
shouldn't I have forbid, forbidden? shouldn't you have forbid, forbidden? shouldn't she have forbid, forbidden? shouldn't we have forbid, forbidden? shouldn't you have forbid, forbidden? shouldn't they have forbid, forbidden?
V-ing perfect
shouldn't I have been forbidding? shouldn't you have been forbidding? shouldn't she have been forbidding? shouldn't we have been forbidding? shouldn't you have been forbidding? shouldn't they have been forbidding?