English verb conjugation
SHOULD TRAIL

Regular verb: trail - trailed - trailed

Affirmation

Simple form	V-ing form
I'd trail you'd trail he'd trail we'd trail you'd trail they'd trail	I'd be trailing you'd be trailing he'd be trailing we'd be trailing you'd be trailing they'd be trailing
Perfect	V-ing perfect
I should've trailed you should've trailed he should've trailed we should've trailed you should've trailed they should've trailed	I should've been trailing you should've been trailing he should've been trailing we should've been trailing you should've been trailing they should've been trailing

Negation

Simple form	V-ing form
I shouldn't trail you shouldn't trail he shouldn't trail we shouldn't trail you shouldn't trail they shouldn't trail	I shouldn't be trailing you shouldn't be trailing he shouldn't be trailing we shouldn't be trailing you shouldn't be trailing they shouldn't be trailing
Perfect	V-ing perfect
I shouldn't have trailed you shouldn't have trailed he shouldn't have trailed we shouldn't have trailed you shouldn't have trailed they shouldn't have trailed	I shouldn't have been trailing you shouldn't have been trailing he shouldn't have been trailing we shouldn't have been trailing you shouldn't have been trailing they shouldn't have been trailing

Interrogative form

Simple form	V-ing form
should I trail? should you trail? should he trail? should we trail? should you trail? should they trail?	should I be trailing? should you be trailing? should he be trailing? should we be trailing? should you be trailing? should they be trailing?
Perfect	V-ing perfect
should I have trailed? should you have trailed? should he have trailed? should we have trailed? should you have trailed? should they have trailed?	should I have been trailing? should you have been trailing? should he have been trailing? should we have been trailing? should you have been trailing? should they have been trailing?

Interro-negative form

Simple form	V-ing form
shouldn't I trail? shouldn't you trail? shouldn't he trail? shouldn't we trail? shouldn't you trail? shouldn't they trail?	shouldn't I be trailing? shouldn't you be trailing? shouldn't he be trailing? shouldn't we be trailing? shouldn't you be trailing? shouldn't they be trailing?
Perfect	V-ing perfect
shouldn't I have trailed? shouldn't you have trailed? shouldn't he have trailed? shouldn't we have trailed? shouldn't you have trailed? shouldn't they have trailed?	shouldn't I have been trailing? shouldn't you have been trailing? shouldn't he have been trailing? shouldn't we have been trailing? shouldn't you have been trailing? shouldn't they have been trailing?