must feather
Regular verb: feather - feathered- feathered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must feather
you must feather
he must feather
we must feather
you must feather
they must feather 	I must be feathering
you must be feathering
he must be feathering
we must be feathering
you must be feathering
they must be feathering	I must have feathered
you must have feathered
he must have feathered
we must have feathered
you must have feathered
they must have feathered	I must have been feathering
you must have been feathering
he must have been feathering
we must have been feathering
you must have been feathering
they must have been feathering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not feather
you must not feather
he must not feather
we must not feather
you must not feather
they must not feather 	I must not be feathering
you must not be feathering
he must not be feathering
we must not be feathering
you must not be feathering
they must not be feathering	I must not have feathered
you must not have feathered
he must not have feathered
we must not have feathered
you must not have feathered
they must not have feathered	I must not have been feathering
you must not have been feathering
he must not have been feathering
we must not have been feathering
you must not have been feathering
they must not have been feathering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I feather?
must you feather?
must he feather?
must we feather?
must you feather?
must they feather? 	must I be feathering?
must you be feathering?
must he be feathering?
must we be feathering?
must you be feathering?
must they be feathering? 	must I have feathered?
must you have feathered?
must he have feathered?
must we have feathered?
must you have feathered?
must they have feathered? 	must I have been feathering?
must you have been feathering?
must he have been feathering?
must we have been feathering?
must you have been feathering?
must they have been feathering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not feather?
must you not feather?
must he not feather?
must we not feather?
must you not feather?
must they not feather? 	must I not be feathering?
must you not be feathering?
must he not be feathering?
must we not be feathering?
must you not be feathering?
must they not be feathering? 	must I not have feathered?
must you not have feathered?
must he not have feathered?
must we not have feathered?
must you not have feathered?
must they not have feathered? 	must I not have been feathering?
must you not have been feathering?
must he not have been feathering?
must we not have been feathering?
must you not have been feathering?
must they not have been feathering?