should trail
Regular verb: trail - trailed- trailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd trail
you'd trail
she'd trail
we'd trail
you'd trail
they'd trail 	I'd be trailing
you'd be trailing
she'd be trailing
we'd be trailing
you'd be trailing
they'd be trailing	I should've trailed
you should've trailed
she 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
she 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 	Perfect 	V-ing perfect 	
I shouldn't trail
you shouldn't trail
she 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
she shouldn't be trailing
we shouldn't be trailing
you shouldn't be trailing
they shouldn't be trailing	I shouldn't have trailed
you shouldn't have trailed
she 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
she 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 	Perfect 	V-ing perfect 	
should I trail?
should you trail?
should she trail?
should we trail?
should you trail?
should they trail? 	should I be trailing?
should you be trailing?
should she be trailing?
should we be trailing?
should you be trailing?
should they be trailing? 	should I have trailed?
should you have trailed?
should she 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 she 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 	Perfect 	V-ing perfect 	
shouldn't I trail?
shouldn't you trail?
shouldn't she 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 she be trailing?
shouldn't we be trailing?
shouldn't you be trailing?
shouldn't they be trailing? 	shouldn't I have trailed?
shouldn't you have trailed?
shouldn't she 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 she have been trailing?
shouldn't we have been trailing?
shouldn't you have been trailing?
shouldn't they have been trailing?