English verb conjugation
SHOULD FIRM

Regular verb: firm - firmed - firmed

Affirmation

Simple form	V-ing form
I should firm you should firm she should firm we should firm you should firm they should firm	I should be firming you should be firming she should be firming we should be firming you should be firming they should be firming
Perfect	V-ing perfect
I should have firmed you should have firmed she should have firmed we should have firmed you should have firmed they should have firmed	I should have been firming you should have been firming she should have been firming we should have been firming you should have been firming they should have been firming

Negation

Simple form	V-ing form
I should not firm you should not firm she should not firm we should not firm you should not firm they should not firm	I should not be firming you should not be firming she should not be firming we should not be firming you should not be firming they should not be firming
Perfect	V-ing perfect
I should not have firmed you should not have firmed she should not have firmed we should not have firmed you should not have firmed they should not have firmed	I should not have been firming you should not have been firming she should not have been firming we should not have been firming you should not have been firming they should not have been firming

Interrogative form

Simple form	V-ing form
should I firm? should you firm? should she firm? should we firm? should you firm? should they firm?	should I be firming? should you be firming? should she be firming? should we be firming? should you be firming? should they be firming?
Perfect	V-ing perfect
should I have firmed? should you have firmed? should she have firmed? should we have firmed? should you have firmed? should they have firmed?	should I have been firming? should you have been firming? should she have been firming? should we have been firming? should you have been firming? should they have been firming?

Interro-negative form

Simple form	V-ing form
should I not firm? should you not firm? should she not firm? should we not firm? should you not firm? should they not firm?	should I not be firming? should you not be firming? should she not be firming? should we not be firming? should you not be firming? should they not be firming?
Perfect	V-ing perfect
should I not have firmed? should you not have firmed? should she not have firmed? should we not have firmed? should you not have firmed? should they not have firmed?	should I not have been firming? should you not have been firming? should she not have been firming? should we not have been firming? should you not have been firming? should they not have been firming?