must stale
Regular verb: stale - staled- staled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stale
you must stale
he must stale
we must stale
you must stale
they must stale 	I must be staling
you must be staling
he must be staling
we must be staling
you must be staling
they must be staling	I must have staled
you must have staled
he must have staled
we must have staled
you must have staled
they must have staled	I must have been staling
you must have been staling
he must have been staling
we must have been staling
you must have been staling
they must have been staling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't stale
you mustn't stale
he mustn't stale
we mustn't stale
you mustn't stale
they mustn't stale 	I mustn't be staling
you mustn't be staling
he mustn't be staling
we mustn't be staling
you mustn't be staling
they mustn't be staling	I mustn't have staled
you mustn't have staled
he mustn't have staled
we mustn't have staled
you mustn't have staled
they mustn't have staled	I mustn't have been staling
you mustn't have been staling
he mustn't have been staling
we mustn't have been staling
you mustn't have been staling
they mustn't have been staling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stale?
must you stale?
must he stale?
must we stale?
must you stale?
must they stale? 	must I be staling?
must you be staling?
must he be staling?
must we be staling?
must you be staling?
must they be staling? 	must I have staled?
must you have staled?
must he have staled?
must we have staled?
must you have staled?
must they have staled? 	must I have been staling?
must you have been staling?
must he have been staling?
must we have been staling?
must you have been staling?
must they have been staling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I stale?
mustn't you stale?
mustn't he stale?
mustn't we stale?
mustn't you stale?
mustn't they stale? 	mustn't I be staling?
mustn't you be staling?
mustn't he be staling?
mustn't we be staling?
mustn't you be staling?
mustn't they be staling? 	mustn't I have staled?
mustn't you have staled?
mustn't he have staled?
mustn't we have staled?
mustn't you have staled?
mustn't they have staled? 	mustn't I have been staling?
mustn't you have been staling?
mustn't he have been staling?
mustn't we have been staling?
mustn't you have been staling?
mustn't they have been staling?