should stale
Regular verb: stale - staled- staled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd stale
you'd stale
he'd stale
we'd stale
you'd stale
they'd stale 	I'd be staling
you'd be staling
he'd be staling
we'd be staling
you'd be staling
they'd be staling	I should've staled
you should've staled
he should've staled
we should've staled
you should've staled
they should've staled	I should've been staling
you should've been staling
he should've been staling
we should've been staling
you should've been staling
they should've been staling	

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

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

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