English verb conjugation
SHOULD CONTEND

Regular verb: contend - contended - contended

Affirmation

Simple form	V-ing form
I'd contend you'd contend he'd contend we'd contend you'd contend they'd contend	I'd be contending you'd be contending he'd be contending we'd be contending you'd be contending they'd be contending
Perfect	V-ing perfect
I should've contended you should've contended he should've contended we should've contended you should've contended they should've contended	I should've been contending you should've been contending he should've been contending we should've been contending you should've been contending they should've been contending

Negation

Simple form	V-ing form
I shouldn't contend you shouldn't contend he shouldn't contend we shouldn't contend you shouldn't contend they shouldn't contend	I shouldn't be contending you shouldn't be contending he shouldn't be contending we shouldn't be contending you shouldn't be contending they shouldn't be contending
Perfect	V-ing perfect
I shouldn't have contended you shouldn't have contended he shouldn't have contended we shouldn't have contended you shouldn't have contended they shouldn't have contended	I shouldn't have been contending you shouldn't have been contending he shouldn't have been contending we shouldn't have been contending you shouldn't have been contending they shouldn't have been contending

Interrogative form

Simple form	V-ing form
should I contend? should you contend? should he contend? should we contend? should you contend? should they contend?	should I be contending? should you be contending? should he be contending? should we be contending? should you be contending? should they be contending?
Perfect	V-ing perfect
should I have contended? should you have contended? should he have contended? should we have contended? should you have contended? should they have contended?	should I have been contending? should you have been contending? should he have been contending? should we have been contending? should you have been contending? should they have been contending?

Interro-negative form

Simple form	V-ing form
shouldn't I contend? shouldn't you contend? shouldn't he contend? shouldn't we contend? shouldn't you contend? shouldn't they contend?	shouldn't I be contending? shouldn't you be contending? shouldn't he be contending? shouldn't we be contending? shouldn't you be contending? shouldn't they be contending?
Perfect	V-ing perfect
shouldn't I have contended? shouldn't you have contended? shouldn't he have contended? shouldn't we have contended? shouldn't you have contended? shouldn't they have contended?	shouldn't I have been contending? shouldn't you have been contending? shouldn't he have been contending? shouldn't we have been contending? shouldn't you have been contending? shouldn't they have been contending?