could flip
Regular verb: flip - flipped- flipped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could flip
you could flip
he could flip
we could flip
you could flip
they could flip 	I could be flipping
you could be flipping
he could be flipping
we could be flipping
you could be flipping
they could be flipping	I could have flipped
you could have flipped
he could have flipped
we could have flipped
you could have flipped
they could have flipped	I could have been flipping
you could have been flipping
he could have been flipping
we could have been flipping
you could have been flipping
they could have been flipping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't flip
you couldn't flip
he couldn't flip
we couldn't flip
you couldn't flip
they couldn't flip 	I couldn't be flipping
you couldn't be flipping
he couldn't be flipping
we couldn't be flipping
you couldn't be flipping
they couldn't be flipping	I couldn't have flipped
you couldn't have flipped
he couldn't have flipped
we couldn't have flipped
you couldn't have flipped
they couldn't have flipped	I couldn't have been flipping
you couldn't have been flipping
he couldn't have been flipping
we couldn't have been flipping
you couldn't have been flipping
they couldn't have been flipping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I flip?
could you flip?
could he flip?
could we flip?
could you flip?
could they flip? 	could I be flipping?
could you be flipping?
could he be flipping?
could we be flipping?
could you be flipping?
could they be flipping? 	could I have flipped?
could you have flipped?
could he have flipped?
could we have flipped?
could you have flipped?
could they have flipped? 	could I have been flipping?
could you have been flipping?
could he have been flipping?
could we have been flipping?
could you have been flipping?
could they have been flipping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I flip?
couldn't you flip?
couldn't he flip?
couldn't we flip?
couldn't you flip?
couldn't they flip? 	couldn't I be flipping?
couldn't you be flipping?
couldn't he be flipping?
couldn't we be flipping?
couldn't you be flipping?
couldn't they be flipping? 	couldn't I have flipped?
couldn't you have flipped?
couldn't he have flipped?
couldn't we have flipped?
couldn't you have flipped?
couldn't they have flipped? 	couldn't I have been flipping?
couldn't you have been flipping?
couldn't he have been flipping?
couldn't we have been flipping?
couldn't you have been flipping?
couldn't they have been flipping?