English verb conjugation
SHOULD UNDERACHIEVE

Regular verb: underachieve - underachieved - underachieved

Affirmation

Simple form	V-ing form
I'd underachieve you'd underachieve he'd underachieve we'd underachieve you'd underachieve they'd underachieve	I'd be underachieving you'd be underachieving he'd be underachieving we'd be underachieving you'd be underachieving they'd be underachieving
Perfect	V-ing perfect
I should've underachieved you should've underachieved he should've underachieved we should've underachieved you should've underachieved they should've underachieved	I should've been underachieving you should've been underachieving he should've been underachieving we should've been underachieving you should've been underachieving they should've been underachieving

Negation

Simple form	V-ing form
I shouldn't underachieve you shouldn't underachieve he shouldn't underachieve we shouldn't underachieve you shouldn't underachieve they shouldn't underachieve	I shouldn't be underachieving you shouldn't be underachieving he shouldn't be underachieving we shouldn't be underachieving you shouldn't be underachieving they shouldn't be underachieving
Perfect	V-ing perfect
I shouldn't have underachieved you shouldn't have underachieved he shouldn't have underachieved we shouldn't have underachieved you shouldn't have underachieved they shouldn't have underachieved	I shouldn't have been underachieving you shouldn't have been underachieving he shouldn't have been underachieving we shouldn't have been underachieving you shouldn't have been underachieving they shouldn't have been underachieving

Interrogative form

Simple form	V-ing form
should I underachieve? should you underachieve? should he underachieve? should we underachieve? should you underachieve? should they underachieve?	should I be underachieving? should you be underachieving? should he be underachieving? should we be underachieving? should you be underachieving? should they be underachieving?
Perfect	V-ing perfect
should I have underachieved? should you have underachieved? should he have underachieved? should we have underachieved? should you have underachieved? should they have underachieved?	should I have been underachieving? should you have been underachieving? should he have been underachieving? should we have been underachieving? should you have been underachieving? should they have been underachieving?

Interro-negative form

Simple form	V-ing form
shouldn't I underachieve? shouldn't you underachieve? shouldn't he underachieve? shouldn't we underachieve? shouldn't you underachieve? shouldn't they underachieve?	shouldn't I be underachieving? shouldn't you be underachieving? shouldn't he be underachieving? shouldn't we be underachieving? shouldn't you be underachieving? shouldn't they be underachieving?
Perfect	V-ing perfect
shouldn't I have underachieved? shouldn't you have underachieved? shouldn't he have underachieved? shouldn't we have underachieved? shouldn't you have underachieved? shouldn't they have underachieved?	shouldn't I have been underachieving? shouldn't you have been underachieving? shouldn't he have been underachieving? shouldn't we have been underachieving? shouldn't you have been underachieving? shouldn't they have been underachieving?