I can stale you can stale she can stale we can stale you can stale they can stale
V-ing form
I can be staling you can be staling she can be staling we can be staling you can be staling they can be staling
Perfect
I can have staled you can have staled she can have staled we can have staled you can have staled they can have staled
V-ing perfect
I can have been staling you can have been staling she can have been staling we can have been staling you can have been staling they can have been staling
Negation
Simple form
I can't stale you can't stale she can't stale we can't stale you can't stale they can't stale
V-ing form
I can't be staling you can't be staling she can't be staling we can't be staling you can't be staling they can't be staling
Perfect
I can't have staled you can't have staled she can't have staled we can't have staled you can't have staled they can't have staled
V-ing perfect
I can't have been staling you can't have been staling she can't have been staling we can't have been staling you can't have been staling they can't have been staling
Interrogative form
Simple form
can I stale? can you stale? can she stale? can we stale? can you stale? can they stale?
V-ing form
can I be staling? can you be staling? can she be staling? can we be staling? can you be staling? can they be staling?
Perfect
can I have staled? can you have staled? can she have staled? can we have staled? can you have staled? can they have staled?
V-ing perfect
can I have been staling? can you have been staling? can she have been staling? can we have been staling? can you have been staling? can they have been staling?
Interro-negative form
Simple form
can't I stale? can't you stale? can't she stale? can't we stale? can't you stale? can't they stale?
V-ing form
can't I be staling? can't you be staling? can't she be staling? can't we be staling? can't you be staling? can't they be staling?
Perfect
can't I have staled? can't you have staled? can't she have staled? can't we have staled? can't you have staled? can't they have staled?
V-ing perfect
can't I have been staling? can't you have been staling? can't she have been staling? can't we have been staling? can't you have been staling? can't they have been staling?