could sideslip
Regular verb: sideslip - sidesliped- sidesliped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sideslip
you could sideslip
he could sideslip
we could sideslip
you could sideslip
they could sideslip 	I could be sidesliping
you could be sidesliping
he could be sidesliping
we could be sidesliping
you could be sidesliping
they could be sidesliping	I could have sidesliped
you could have sidesliped
he could have sidesliped
we could have sidesliped
you could have sidesliped
they could have sidesliped	I could have been sidesliping
you could have been sidesliping
he could have been sidesliping
we could have been sidesliping
you could have been sidesliping
they could have been sidesliping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sideslip
you couldn't sideslip
he couldn't sideslip
we couldn't sideslip
you couldn't sideslip
they couldn't sideslip 	I couldn't be sidesliping
you couldn't be sidesliping
he couldn't be sidesliping
we couldn't be sidesliping
you couldn't be sidesliping
they couldn't be sidesliping	I couldn't have sidesliped
you couldn't have sidesliped
he couldn't have sidesliped
we couldn't have sidesliped
you couldn't have sidesliped
they couldn't have sidesliped	I couldn't have been sidesliping
you couldn't have been sidesliping
he couldn't have been sidesliping
we couldn't have been sidesliping
you couldn't have been sidesliping
they couldn't have been sidesliping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sideslip?
could you sideslip?
could he sideslip?
could we sideslip?
could you sideslip?
could they sideslip? 	could I be sidesliping?
could you be sidesliping?
could he be sidesliping?
could we be sidesliping?
could you be sidesliping?
could they be sidesliping? 	could I have sidesliped?
could you have sidesliped?
could he have sidesliped?
could we have sidesliped?
could you have sidesliped?
could they have sidesliped? 	could I have been sidesliping?
could you have been sidesliping?
could he have been sidesliping?
could we have been sidesliping?
could you have been sidesliping?
could they have been sidesliping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sideslip?
couldn't you sideslip?
couldn't he sideslip?
couldn't we sideslip?
couldn't you sideslip?
couldn't they sideslip? 	couldn't I be sidesliping?
couldn't you be sidesliping?
couldn't he be sidesliping?
couldn't we be sidesliping?
couldn't you be sidesliping?
couldn't they be sidesliping? 	couldn't I have sidesliped?
couldn't you have sidesliped?
couldn't he have sidesliped?
couldn't we have sidesliped?
couldn't you have sidesliped?
couldn't they have sidesliped? 	couldn't I have been sidesliping?
couldn't you have been sidesliping?
couldn't he have been sidesliping?
couldn't we have been sidesliping?
couldn't you have been sidesliping?
couldn't they have been sidesliping?