must clamp
Regular verb: clamp - clamped- clamped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must clamp
you must clamp
he must clamp
we must clamp
you must clamp
they must clamp 	I must be clamping
you must be clamping
he must be clamping
we must be clamping
you must be clamping
they must be clamping	I must have clamped
you must have clamped
he must have clamped
we must have clamped
you must have clamped
they must have clamped	I must have been clamping
you must have been clamping
he must have been clamping
we must have been clamping
you must have been clamping
they must have been clamping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't clamp
you mustn't clamp
he mustn't clamp
we mustn't clamp
you mustn't clamp
they mustn't clamp 	I mustn't be clamping
you mustn't be clamping
he mustn't be clamping
we mustn't be clamping
you mustn't be clamping
they mustn't be clamping	I mustn't have clamped
you mustn't have clamped
he mustn't have clamped
we mustn't have clamped
you mustn't have clamped
they mustn't have clamped	I mustn't have been clamping
you mustn't have been clamping
he mustn't have been clamping
we mustn't have been clamping
you mustn't have been clamping
they mustn't have been clamping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I clamp?
must you clamp?
must he clamp?
must we clamp?
must you clamp?
must they clamp? 	must I be clamping?
must you be clamping?
must he be clamping?
must we be clamping?
must you be clamping?
must they be clamping? 	must I have clamped?
must you have clamped?
must he have clamped?
must we have clamped?
must you have clamped?
must they have clamped? 	must I have been clamping?
must you have been clamping?
must he have been clamping?
must we have been clamping?
must you have been clamping?
must they have been clamping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I clamp?
mustn't you clamp?
mustn't he clamp?
mustn't we clamp?
mustn't you clamp?
mustn't they clamp? 	mustn't I be clamping?
mustn't you be clamping?
mustn't he be clamping?
mustn't we be clamping?
mustn't you be clamping?
mustn't they be clamping? 	mustn't I have clamped?
mustn't you have clamped?
mustn't he have clamped?
mustn't we have clamped?
mustn't you have clamped?
mustn't they have clamped? 	mustn't I have been clamping?
mustn't you have been clamping?
mustn't he have been clamping?
mustn't we have been clamping?
mustn't you have been clamping?
mustn't they have been clamping?