could skid
Regular verb: skid - skidded- skidded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could skid
you could skid
she could skid
we could skid
you could skid
they could skid 	I could be skidding
you could be skidding
she could be skidding
we could be skidding
you could be skidding
they could be skidding	I could have skidded
you could have skidded
she could have skidded
we could have skidded
you could have skidded
they could have skidded	I could have been skidding
you could have been skidding
she could have been skidding
we could have been skidding
you could have been skidding
they could have been skidding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't skid
you couldn't skid
she couldn't skid
we couldn't skid
you couldn't skid
they couldn't skid 	I couldn't be skidding
you couldn't be skidding
she couldn't be skidding
we couldn't be skidding
you couldn't be skidding
they couldn't be skidding	I couldn't have skidded
you couldn't have skidded
she couldn't have skidded
we couldn't have skidded
you couldn't have skidded
they couldn't have skidded	I couldn't have been skidding
you couldn't have been skidding
she couldn't have been skidding
we couldn't have been skidding
you couldn't have been skidding
they couldn't have been skidding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I skid?
could you skid?
could she skid?
could we skid?
could you skid?
could they skid? 	could I be skidding?
could you be skidding?
could she be skidding?
could we be skidding?
could you be skidding?
could they be skidding? 	could I have skidded?
could you have skidded?
could she have skidded?
could we have skidded?
could you have skidded?
could they have skidded? 	could I have been skidding?
could you have been skidding?
could she have been skidding?
could we have been skidding?
could you have been skidding?
could they have been skidding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I skid?
couldn't you skid?
couldn't she skid?
couldn't we skid?
couldn't you skid?
couldn't they skid? 	couldn't I be skidding?
couldn't you be skidding?
couldn't she be skidding?
couldn't we be skidding?
couldn't you be skidding?
couldn't they be skidding? 	couldn't I have skidded?
couldn't you have skidded?
couldn't she have skidded?
couldn't we have skidded?
couldn't you have skidded?
couldn't they have skidded? 	couldn't I have been skidding?
couldn't you have been skidding?
couldn't she have been skidding?
couldn't we have been skidding?
couldn't you have been skidding?
couldn't they have been skidding?