could flicker
Regular verb: flicker - flickered- flickered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could flicker
you could flicker
he could flicker
we could flicker
you could flicker
they could flicker 	I could be flickering
you could be flickering
he could be flickering
we could be flickering
you could be flickering
they could be flickering	I could have flickered
you could have flickered
he could have flickered
we could have flickered
you could have flickered
they could have flickered	I could have been flickering
you could have been flickering
he could have been flickering
we could have been flickering
you could have been flickering
they could have been flickering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not flicker
you could not flicker
he could not flicker
we could not flicker
you could not flicker
they could not flicker 	I could not be flickering
you could not be flickering
he could not be flickering
we could not be flickering
you could not be flickering
they could not be flickering	I could not have flickered
you could not have flickered
he could not have flickered
we could not have flickered
you could not have flickered
they could not have flickered	I could not have been flickering
you could not have been flickering
he could not have been flickering
we could not have been flickering
you could not have been flickering
they could not have been flickering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I flicker?
could you flicker?
could he flicker?
could we flicker?
could you flicker?
could they flicker? 	could I be flickering?
could you be flickering?
could he be flickering?
could we be flickering?
could you be flickering?
could they be flickering? 	could I have flickered?
could you have flickered?
could he have flickered?
could we have flickered?
could you have flickered?
could they have flickered? 	could I have been flickering?
could you have been flickering?
could he have been flickering?
could we have been flickering?
could you have been flickering?
could they have been flickering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not flicker?
could you not flicker?
could he not flicker?
could we not flicker?
could you not flicker?
could they not flicker? 	could I not be flickering?
could you not be flickering?
could he not be flickering?
could we not be flickering?
could you not be flickering?
could they not be flickering? 	could I not have flickered?
could you not have flickered?
could he not have flickered?
could we not have flickered?
could you not have flickered?
could they not have flickered? 	could I not have been flickering?
could you not have been flickering?
could he not have been flickering?
could we not have been flickering?
could you not have been flickering?
could they not have been flickering?