must flicker
Regular verb: flicker - flickered- flickered

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

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

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

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