should skateboard
Regular verb: skateboard - skateboarded- skateboarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should skateboard
you should skateboard
he should skateboard
we should skateboard
you should skateboard
they should skateboard 	I should be skateboarding
you should be skateboarding
he should be skateboarding
we should be skateboarding
you should be skateboarding
they should be skateboarding	I should have skateboarded
you should have skateboarded
he should have skateboarded
we should have skateboarded
you should have skateboarded
they should have skateboarded	I should have been skateboarding
you should have been skateboarding
he should have been skateboarding
we should have been skateboarding
you should have been skateboarding
they should have been skateboarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not skateboard
you should not skateboard
he should not skateboard
we should not skateboard
you should not skateboard
they should not skateboard 	I should not be skateboarding
you should not be skateboarding
he should not be skateboarding
we should not be skateboarding
you should not be skateboarding
they should not be skateboarding	I should not have skateboarded
you should not have skateboarded
he should not have skateboarded
we should not have skateboarded
you should not have skateboarded
they should not have skateboarded	I should not have been skateboarding
you should not have been skateboarding
he should not have been skateboarding
we should not have been skateboarding
you should not have been skateboarding
they should not have been skateboarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I skateboard?
should you skateboard?
should he skateboard?
should we skateboard?
should you skateboard?
should they skateboard? 	should I be skateboarding?
should you be skateboarding?
should he be skateboarding?
should we be skateboarding?
should you be skateboarding?
should they be skateboarding? 	should I have skateboarded?
should you have skateboarded?
should he have skateboarded?
should we have skateboarded?
should you have skateboarded?
should they have skateboarded? 	should I have been skateboarding?
should you have been skateboarding?
should he have been skateboarding?
should we have been skateboarding?
should you have been skateboarding?
should they have been skateboarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not skateboard?
should you not skateboard?
should he not skateboard?
should we not skateboard?
should you not skateboard?
should they not skateboard? 	should I not be skateboarding?
should you not be skateboarding?
should he not be skateboarding?
should we not be skateboarding?
should you not be skateboarding?
should they not be skateboarding? 	should I not have skateboarded?
should you not have skateboarded?
should he not have skateboarded?
should we not have skateboarded?
should you not have skateboarded?
should they not have skateboarded? 	should I not have been skateboarding?
should you not have been skateboarding?
should he not have been skateboarding?
should we not have been skateboarding?
should you not have been skateboarding?
should they not have been skateboarding?