should tunnel
Regular verb: tunnel - tunnelled- tunnelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should tunnel
you should tunnel
he should tunnel
we should tunnel
you should tunnel
they should tunnel 	I should be tunnelling
you should be tunnelling
he should be tunnelling
we should be tunnelling
you should be tunnelling
they should be tunnelling	I should have tunnelled
you should have tunnelled
he should have tunnelled
we should have tunnelled
you should have tunnelled
they should have tunnelled	I should have been tunnelling
you should have been tunnelling
he should have been tunnelling
we should have been tunnelling
you should have been tunnelling
they should have been tunnelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not tunnel
you should not tunnel
he should not tunnel
we should not tunnel
you should not tunnel
they should not tunnel 	I should not be tunnelling
you should not be tunnelling
he should not be tunnelling
we should not be tunnelling
you should not be tunnelling
they should not be tunnelling	I should not have tunnelled
you should not have tunnelled
he should not have tunnelled
we should not have tunnelled
you should not have tunnelled
they should not have tunnelled	I should not have been tunnelling
you should not have been tunnelling
he should not have been tunnelling
we should not have been tunnelling
you should not have been tunnelling
they should not have been tunnelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I tunnel?
should you tunnel?
should he tunnel?
should we tunnel?
should you tunnel?
should they tunnel? 	should I be tunnelling?
should you be tunnelling?
should he be tunnelling?
should we be tunnelling?
should you be tunnelling?
should they be tunnelling? 	should I have tunnelled?
should you have tunnelled?
should he 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 he 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 	
should I not tunnel?
should you not tunnel?
should he not tunnel?
should we not tunnel?
should you not tunnel?
should they not tunnel? 	should I not be tunnelling?
should you not be tunnelling?
should he not be tunnelling?
should we not be tunnelling?
should you not be tunnelling?
should they not be tunnelling? 	should I not have tunnelled?
should you not have tunnelled?
should he not have tunnelled?
should we not have tunnelled?
should you not have tunnelled?
should they not have tunnelled? 	should I not have been tunnelling?
should you not have been tunnelling?
should he not have been tunnelling?
should we not have been tunnelling?
should you not have been tunnelling?
should they not have been tunnelling?