could swap
Regular verb: swap - swaped- swaped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could swap
you could swap
she could swap
we could swap
you could swap
they could swap 	I could be swaping
you could be swaping
she could be swaping
we could be swaping
you could be swaping
they could be swaping	I could have swaped
you could have swaped
she could have swaped
we could have swaped
you could have swaped
they could have swaped	I could have been swaping
you could have been swaping
she could have been swaping
we could have been swaping
you could have been swaping
they could have been swaping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not swap
you could not swap
she could not swap
we could not swap
you could not swap
they could not swap 	I could not be swaping
you could not be swaping
she could not be swaping
we could not be swaping
you could not be swaping
they could not be swaping	I could not have swaped
you could not have swaped
she could not have swaped
we could not have swaped
you could not have swaped
they could not have swaped	I could not have been swaping
you could not have been swaping
she could not have been swaping
we could not have been swaping
you could not have been swaping
they could not have been swaping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I swap?
could you swap?
could she swap?
could we swap?
could you swap?
could they swap? 	could I be swaping?
could you be swaping?
could she be swaping?
could we be swaping?
could you be swaping?
could they be swaping? 	could I have swaped?
could you have swaped?
could she have swaped?
could we have swaped?
could you have swaped?
could they have swaped? 	could I have been swaping?
could you have been swaping?
could she have been swaping?
could we have been swaping?
could you have been swaping?
could they have been swaping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not swap?
could you not swap?
could she not swap?
could we not swap?
could you not swap?
could they not swap? 	could I not be swaping?
could you not be swaping?
could she not be swaping?
could we not be swaping?
could you not be swaping?
could they not be swaping? 	could I not have swaped?
could you not have swaped?
could she not have swaped?
could we not have swaped?
could you not have swaped?
could they not have swaped? 	could I not have been swaping?
could you not have been swaping?
could she not have been swaping?
could we not have been swaping?
could you not have been swaping?
could they not have been swaping?