English verb conjugation
SHOULD SUM

Regular verb: sum - summed - summed

Affirmation

Simple form	V-ing form
I'd sum you'd sum she'd sum we'd sum you'd sum they'd sum	I'd be summing you'd be summing she'd be summing we'd be summing you'd be summing they'd be summing
Perfect	V-ing perfect
I should've summed you should've summed she should've summed we should've summed you should've summed they should've summed	I should've been summing you should've been summing she should've been summing we should've been summing you should've been summing they should've been summing

Negation

Simple form	V-ing form
I shouldn't sum you shouldn't sum she shouldn't sum we shouldn't sum you shouldn't sum they shouldn't sum	I shouldn't be summing you shouldn't be summing she shouldn't be summing we shouldn't be summing you shouldn't be summing they shouldn't be summing
Perfect	V-ing perfect
I shouldn't have summed you shouldn't have summed she shouldn't have summed we shouldn't have summed you shouldn't have summed they shouldn't have summed	I shouldn't have been summing you shouldn't have been summing she shouldn't have been summing we shouldn't have been summing you shouldn't have been summing they shouldn't have been summing

Interrogative form

Simple form	V-ing form
should I sum? should you sum? should she sum? should we sum? should you sum? should they sum?	should I be summing? should you be summing? should she be summing? should we be summing? should you be summing? should they be summing?
Perfect	V-ing perfect
should I have summed? should you have summed? should she have summed? should we have summed? should you have summed? should they have summed?	should I have been summing? should you have been summing? should she have been summing? should we have been summing? should you have been summing? should they have been summing?

Interro-negative form

Simple form	V-ing form
shouldn't I sum? shouldn't you sum? shouldn't she sum? shouldn't we sum? shouldn't you sum? shouldn't they sum?	shouldn't I be summing? shouldn't you be summing? shouldn't she be summing? shouldn't we be summing? shouldn't you be summing? shouldn't they be summing?
Perfect	V-ing perfect
shouldn't I have summed? shouldn't you have summed? shouldn't she have summed? shouldn't we have summed? shouldn't you have summed? shouldn't they have summed?	shouldn't I have been summing? shouldn't you have been summing? shouldn't she have been summing? shouldn't we have been summing? shouldn't you have been summing? shouldn't they have been summing?