could skirl
Regular verb: skirl - skirled- skirled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could skirl
you could skirl
she could skirl
we could skirl
you could skirl
they could skirl 	I could be skirling
you could be skirling
she could be skirling
we could be skirling
you could be skirling
they could be skirling	I could have skirled
you could have skirled
she could have skirled
we could have skirled
you could have skirled
they could have skirled	I could have been skirling
you could have been skirling
she could have been skirling
we could have been skirling
you could have been skirling
they could have been skirling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't skirl
you couldn't skirl
she couldn't skirl
we couldn't skirl
you couldn't skirl
they couldn't skirl 	I couldn't be skirling
you couldn't be skirling
she couldn't be skirling
we couldn't be skirling
you couldn't be skirling
they couldn't be skirling	I couldn't have skirled
you couldn't have skirled
she couldn't have skirled
we couldn't have skirled
you couldn't have skirled
they couldn't have skirled	I couldn't have been skirling
you couldn't have been skirling
she couldn't have been skirling
we couldn't have been skirling
you couldn't have been skirling
they couldn't have been skirling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I skirl?
could you skirl?
could she skirl?
could we skirl?
could you skirl?
could they skirl? 	could I be skirling?
could you be skirling?
could she be skirling?
could we be skirling?
could you be skirling?
could they be skirling? 	could I have skirled?
could you have skirled?
could she have skirled?
could we have skirled?
could you have skirled?
could they have skirled? 	could I have been skirling?
could you have been skirling?
could she have been skirling?
could we have been skirling?
could you have been skirling?
could they have been skirling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I skirl?
couldn't you skirl?
couldn't she skirl?
couldn't we skirl?
couldn't you skirl?
couldn't they skirl? 	couldn't I be skirling?
couldn't you be skirling?
couldn't she be skirling?
couldn't we be skirling?
couldn't you be skirling?
couldn't they be skirling? 	couldn't I have skirled?
couldn't you have skirled?
couldn't she have skirled?
couldn't we have skirled?
couldn't you have skirled?
couldn't they have skirled? 	couldn't I have been skirling?
couldn't you have been skirling?
couldn't she have been skirling?
couldn't we have been skirling?
couldn't you have been skirling?
couldn't they have been skirling?