could parasail
Regular verb: parasail - parasailed- parasailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could parasail
you could parasail
he could parasail
we could parasail
you could parasail
they could parasail 	I could be parasailing
you could be parasailing
he could be parasailing
we could be parasailing
you could be parasailing
they could be parasailing	I could have parasailed
you could have parasailed
he could have parasailed
we could have parasailed
you could have parasailed
they could have parasailed	I could have been parasailing
you could have been parasailing
he could have been parasailing
we could have been parasailing
you could have been parasailing
they could have been parasailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't parasail
you couldn't parasail
he couldn't parasail
we couldn't parasail
you couldn't parasail
they couldn't parasail 	I couldn't be parasailing
you couldn't be parasailing
he couldn't be parasailing
we couldn't be parasailing
you couldn't be parasailing
they couldn't be parasailing	I couldn't have parasailed
you couldn't have parasailed
he couldn't have parasailed
we couldn't have parasailed
you couldn't have parasailed
they couldn't have parasailed	I couldn't have been parasailing
you couldn't have been parasailing
he couldn't have been parasailing
we couldn't have been parasailing
you couldn't have been parasailing
they couldn't have been parasailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I parasail?
could you parasail?
could he parasail?
could we parasail?
could you parasail?
could they parasail? 	could I be parasailing?
could you be parasailing?
could he be parasailing?
could we be parasailing?
could you be parasailing?
could they be parasailing? 	could I have parasailed?
could you have parasailed?
could he have parasailed?
could we have parasailed?
could you have parasailed?
could they have parasailed? 	could I have been parasailing?
could you have been parasailing?
could he have been parasailing?
could we have been parasailing?
could you have been parasailing?
could they have been parasailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I parasail?
couldn't you parasail?
couldn't he parasail?
couldn't we parasail?
couldn't you parasail?
couldn't they parasail? 	couldn't I be parasailing?
couldn't you be parasailing?
couldn't he be parasailing?
couldn't we be parasailing?
couldn't you be parasailing?
couldn't they be parasailing? 	couldn't I have parasailed?
couldn't you have parasailed?
couldn't he have parasailed?
couldn't we have parasailed?
couldn't you have parasailed?
couldn't they have parasailed? 	couldn't I have been parasailing?
couldn't you have been parasailing?
couldn't he have been parasailing?
couldn't we have been parasailing?
couldn't you have been parasailing?
couldn't they have been parasailing?