should tunnel
Regular verb: tunnel - tunnelled- tunnelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd tunnel
you'd tunnel
she'd tunnel
we'd tunnel
you'd tunnel
they'd tunnel 	I'd be tunnelling
you'd be tunnelling
she'd be tunnelling
we'd be tunnelling
you'd be tunnelling
they'd be tunnelling	I should've tunnelled
you should've tunnelled
she should've tunnelled
we should've tunnelled
you should've tunnelled
they should've tunnelled	I should've been tunnelling
you should've been tunnelling
she should've been tunnelling
we should've been tunnelling
you should've been tunnelling
they should've been tunnelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't tunnel
you shouldn't tunnel
she shouldn't tunnel
we shouldn't tunnel
you shouldn't tunnel
they shouldn't tunnel 	I shouldn't be tunnelling
you shouldn't be tunnelling
she shouldn't be tunnelling
we shouldn't be tunnelling
you shouldn't be tunnelling
they shouldn't be tunnelling	I shouldn't have tunnelled
you shouldn't have tunnelled
she shouldn't have tunnelled
we shouldn't have tunnelled
you shouldn't have tunnelled
they shouldn't have tunnelled	I shouldn't have been tunnelling
you shouldn't have been tunnelling
she shouldn't have been tunnelling
we shouldn't have been tunnelling
you shouldn't have been tunnelling
they shouldn't have been tunnelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I tunnel?
should you tunnel?
should she tunnel?
should we tunnel?
should you tunnel?
should they tunnel? 	should I be tunnelling?
should you be tunnelling?
should she be tunnelling?
should we be tunnelling?
should you be tunnelling?
should they be tunnelling? 	should I have tunnelled?
should you have tunnelled?
should she have tunnelled?
should we have tunnelled?
should you have tunnelled?
should they have tunnelled? 	should I have been tunnelling?
should you have been tunnelling?
should she have been tunnelling?
should we have been tunnelling?
should you have been tunnelling?
should they have been tunnelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I tunnel?
shouldn't you tunnel?
shouldn't she tunnel?
shouldn't we tunnel?
shouldn't you tunnel?
shouldn't they tunnel? 	shouldn't I be tunnelling?
shouldn't you be tunnelling?
shouldn't she be tunnelling?
shouldn't we be tunnelling?
shouldn't you be tunnelling?
shouldn't they be tunnelling? 	shouldn't I have tunnelled?
shouldn't you have tunnelled?
shouldn't she have tunnelled?
shouldn't we have tunnelled?
shouldn't you have tunnelled?
shouldn't they have tunnelled? 	shouldn't I have been tunnelling?
shouldn't you have been tunnelling?
shouldn't she have been tunnelling?
shouldn't we have been tunnelling?
shouldn't you have been tunnelling?
shouldn't they have been tunnelling?