must slump
Regular verb: slump - slumped- slumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must slump
you must slump
she must slump
we must slump
you must slump
they must slump 	I must be slumping
you must be slumping
she must be slumping
we must be slumping
you must be slumping
they must be slumping	I must have slumped
you must have slumped
she must have slumped
we must have slumped
you must have slumped
they must have slumped	I must have been slumping
you must have been slumping
she must have been slumping
we must have been slumping
you must have been slumping
they must have been slumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't slump
you mustn't slump
she mustn't slump
we mustn't slump
you mustn't slump
they mustn't slump 	I mustn't be slumping
you mustn't be slumping
she mustn't be slumping
we mustn't be slumping
you mustn't be slumping
they mustn't be slumping	I mustn't have slumped
you mustn't have slumped
she mustn't have slumped
we mustn't have slumped
you mustn't have slumped
they mustn't have slumped	I mustn't have been slumping
you mustn't have been slumping
she mustn't have been slumping
we mustn't have been slumping
you mustn't have been slumping
they mustn't have been slumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I slump?
must you slump?
must she slump?
must we slump?
must you slump?
must they slump? 	must I be slumping?
must you be slumping?
must she be slumping?
must we be slumping?
must you be slumping?
must they be slumping? 	must I have slumped?
must you have slumped?
must she have slumped?
must we have slumped?
must you have slumped?
must they have slumped? 	must I have been slumping?
must you have been slumping?
must she have been slumping?
must we have been slumping?
must you have been slumping?
must they have been slumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I slump?
mustn't you slump?
mustn't she slump?
mustn't we slump?
mustn't you slump?
mustn't they slump? 	mustn't I be slumping?
mustn't you be slumping?
mustn't she be slumping?
mustn't we be slumping?
mustn't you be slumping?
mustn't they be slumping? 	mustn't I have slumped?
mustn't you have slumped?
mustn't she have slumped?
mustn't we have slumped?
mustn't you have slumped?
mustn't they have slumped? 	mustn't I have been slumping?
mustn't you have been slumping?
mustn't she have been slumping?
mustn't we have been slumping?
mustn't you have been slumping?
mustn't they have been slumping?