must regather
Regular verb: regather - regathered- regathered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must regather
you must regather
she must regather
we must regather
you must regather
they must regather 	I must be regathering
you must be regathering
she must be regathering
we must be regathering
you must be regathering
they must be regathering	I must have regathered
you must have regathered
she must have regathered
we must have regathered
you must have regathered
they must have regathered	I must have been regathering
you must have been regathering
she must have been regathering
we must have been regathering
you must have been regathering
they must have been regathering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't regather
you mustn't regather
she mustn't regather
we mustn't regather
you mustn't regather
they mustn't regather 	I mustn't be regathering
you mustn't be regathering
she mustn't be regathering
we mustn't be regathering
you mustn't be regathering
they mustn't be regathering	I mustn't have regathered
you mustn't have regathered
she mustn't have regathered
we mustn't have regathered
you mustn't have regathered
they mustn't have regathered	I mustn't have been regathering
you mustn't have been regathering
she mustn't have been regathering
we mustn't have been regathering
you mustn't have been regathering
they mustn't have been regathering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I regather?
must you regather?
must she regather?
must we regather?
must you regather?
must they regather? 	must I be regathering?
must you be regathering?
must she be regathering?
must we be regathering?
must you be regathering?
must they be regathering? 	must I have regathered?
must you have regathered?
must she have regathered?
must we have regathered?
must you have regathered?
must they have regathered? 	must I have been regathering?
must you have been regathering?
must she have been regathering?
must we have been regathering?
must you have been regathering?
must they have been regathering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I regather?
mustn't you regather?
mustn't she regather?
mustn't we regather?
mustn't you regather?
mustn't they regather? 	mustn't I be regathering?
mustn't you be regathering?
mustn't she be regathering?
mustn't we be regathering?
mustn't you be regathering?
mustn't they be regathering? 	mustn't I have regathered?
mustn't you have regathered?
mustn't she have regathered?
mustn't we have regathered?
mustn't you have regathered?
mustn't they have regathered? 	mustn't I have been regathering?
mustn't you have been regathering?
mustn't she have been regathering?
mustn't we have been regathering?
mustn't you have been regathering?
mustn't they have been regathering?