could shiver
Regular verb: shiver - shivered- shivered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could shiver
you could shiver
he could shiver
we could shiver
you could shiver
they could shiver 	I could be shivering
you could be shivering
he could be shivering
we could be shivering
you could be shivering
they could be shivering	I could have shivered
you could have shivered
he could have shivered
we could have shivered
you could have shivered
they could have shivered	I could have been shivering
you could have been shivering
he could have been shivering
we could have been shivering
you could have been shivering
they could have been shivering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not shiver
you could not shiver
he could not shiver
we could not shiver
you could not shiver
they could not shiver 	I could not be shivering
you could not be shivering
he could not be shivering
we could not be shivering
you could not be shivering
they could not be shivering	I could not have shivered
you could not have shivered
he could not have shivered
we could not have shivered
you could not have shivered
they could not have shivered	I could not have been shivering
you could not have been shivering
he could not have been shivering
we could not have been shivering
you could not have been shivering
they could not have been shivering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I shiver?
could you shiver?
could he shiver?
could we shiver?
could you shiver?
could they shiver? 	could I be shivering?
could you be shivering?
could he be shivering?
could we be shivering?
could you be shivering?
could they be shivering? 	could I have shivered?
could you have shivered?
could he have shivered?
could we have shivered?
could you have shivered?
could they have shivered? 	could I have been shivering?
could you have been shivering?
could he have been shivering?
could we have been shivering?
could you have been shivering?
could they have been shivering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not shiver?
could you not shiver?
could he not shiver?
could we not shiver?
could you not shiver?
could they not shiver? 	could I not be shivering?
could you not be shivering?
could he not be shivering?
could we not be shivering?
could you not be shivering?
could they not be shivering? 	could I not have shivered?
could you not have shivered?
could he not have shivered?
could we not have shivered?
could you not have shivered?
could they not have shivered? 	could I not have been shivering?
could you not have been shivering?
could he not have been shivering?
could we not have been shivering?
could you not have been shivering?
could they not have been shivering?