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 could not skid
you could not skid
she could not skid
we could not skid
you could not skid
they could not skid 	I could not be skidding
you could not be skidding
she could not be skidding
we could not be skidding
you could not be skidding
they could not be skidding	I could not have skidded
you could not have skidded
she could not have skidded
we could not have skidded
you could not have skidded
they could not have skidded	I could not have been skidding
you could not have been skidding
she could not have been skidding
we could not have been skidding
you could not have been skidding
they could not 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 	
could I not skid?
could you not skid?
could she not skid?
could we not skid?
could you not skid?
could they not skid? 	could I not be skidding?
could you not be skidding?
could she not be skidding?
could we not be skidding?
could you not be skidding?
could they not be skidding? 	could I not have skidded?
could you not have skidded?
could she not have skidded?
could we not have skidded?
could you not have skidded?
could they not have skidded? 	could I not have been skidding?
could you not have been skidding?
could she not have been skidding?
could we not have been skidding?
could you not have been skidding?
could they not have been skidding?