must lower
Regular verb: lower - lowered- lowered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lower
you must lower
she must lower
we must lower
you must lower
they must lower 	I must be lowering
you must be lowering
she must be lowering
we must be lowering
you must be lowering
they must be lowering	I must have lowered
you must have lowered
she must have lowered
we must have lowered
you must have lowered
they must have lowered	I must have been lowering
you must have been lowering
she must have been lowering
we must have been lowering
you must have been lowering
they must have been lowering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lower
you mustn't lower
she mustn't lower
we mustn't lower
you mustn't lower
they mustn't lower 	I mustn't be lowering
you mustn't be lowering
she mustn't be lowering
we mustn't be lowering
you mustn't be lowering
they mustn't be lowering	I mustn't have lowered
you mustn't have lowered
she mustn't have lowered
we mustn't have lowered
you mustn't have lowered
they mustn't have lowered	I mustn't have been lowering
you mustn't have been lowering
she mustn't have been lowering
we mustn't have been lowering
you mustn't have been lowering
they mustn't have been lowering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lower?
must you lower?
must she lower?
must we lower?
must you lower?
must they lower? 	must I be lowering?
must you be lowering?
must she be lowering?
must we be lowering?
must you be lowering?
must they be lowering? 	must I have lowered?
must you have lowered?
must she have lowered?
must we have lowered?
must you have lowered?
must they have lowered? 	must I have been lowering?
must you have been lowering?
must she have been lowering?
must we have been lowering?
must you have been lowering?
must they have been lowering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lower?
mustn't you lower?
mustn't she lower?
mustn't we lower?
mustn't you lower?
mustn't they lower? 	mustn't I be lowering?
mustn't you be lowering?
mustn't she be lowering?
mustn't we be lowering?
mustn't you be lowering?
mustn't they be lowering? 	mustn't I have lowered?
mustn't you have lowered?
mustn't she have lowered?
mustn't we have lowered?
mustn't you have lowered?
mustn't they have lowered? 	mustn't I have been lowering?
mustn't you have been lowering?
mustn't she have been lowering?
mustn't we have been lowering?
mustn't you have been lowering?
mustn't they have been lowering?