can skateboard
Regular verb: skateboard - skateboarded- skateboarded

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

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

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

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