could skeletonise
Regular verb: skeletonise - skeletonised- skeletonised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could skeletonise
you could skeletonise
she could skeletonise
we could skeletonise
you could skeletonise
they could skeletonise 	I could be skeletonising
you could be skeletonising
she could be skeletonising
we could be skeletonising
you could be skeletonising
they could be skeletonising	I could have skeletonised
you could have skeletonised
she could have skeletonised
we could have skeletonised
you could have skeletonised
they could have skeletonised	I could have been skeletonising
you could have been skeletonising
she could have been skeletonising
we could have been skeletonising
you could have been skeletonising
they could have been skeletonising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't skeletonise
you couldn't skeletonise
she couldn't skeletonise
we couldn't skeletonise
you couldn't skeletonise
they couldn't skeletonise 	I couldn't be skeletonising
you couldn't be skeletonising
she couldn't be skeletonising
we couldn't be skeletonising
you couldn't be skeletonising
they couldn't be skeletonising	I couldn't have skeletonised
you couldn't have skeletonised
she couldn't have skeletonised
we couldn't have skeletonised
you couldn't have skeletonised
they couldn't have skeletonised	I couldn't have been skeletonising
you couldn't have been skeletonising
she couldn't have been skeletonising
we couldn't have been skeletonising
you couldn't have been skeletonising
they couldn't have been skeletonising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I skeletonise?
could you skeletonise?
could she skeletonise?
could we skeletonise?
could you skeletonise?
could they skeletonise? 	could I be skeletonising?
could you be skeletonising?
could she be skeletonising?
could we be skeletonising?
could you be skeletonising?
could they be skeletonising? 	could I have skeletonised?
could you have skeletonised?
could she have skeletonised?
could we have skeletonised?
could you have skeletonised?
could they have skeletonised? 	could I have been skeletonising?
could you have been skeletonising?
could she have been skeletonising?
could we have been skeletonising?
could you have been skeletonising?
could they have been skeletonising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I skeletonise?
couldn't you skeletonise?
couldn't she skeletonise?
couldn't we skeletonise?
couldn't you skeletonise?
couldn't they skeletonise? 	couldn't I be skeletonising?
couldn't you be skeletonising?
couldn't she be skeletonising?
couldn't we be skeletonising?
couldn't you be skeletonising?
couldn't they be skeletonising? 	couldn't I have skeletonised?
couldn't you have skeletonised?
couldn't she have skeletonised?
couldn't we have skeletonised?
couldn't you have skeletonised?
couldn't they have skeletonised? 	couldn't I have been skeletonising?
couldn't you have been skeletonising?
couldn't she have been skeletonising?
couldn't we have been skeletonising?
couldn't you have been skeletonising?
couldn't they have been skeletonising?