I could steal you could steal he could steal we could steal you could steal they could steal
V-ing form
I could be stealing you could be stealing he could be stealing we could be stealing you could be stealing they could be stealing
Perfect
I could have stolen you could have stolen he could have stolen we could have stolen you could have stolen they could have stolen
V-ing perfect
I could have been stealing you could have been stealing he could have been stealing we could have been stealing you could have been stealing they could have been stealing
Negation
Simple form
I could not steal you could not steal he could not steal we could not steal you could not steal they could not steal
V-ing form
I could not be stealing you could not be stealing he could not be stealing we could not be stealing you could not be stealing they could not be stealing
Perfect
I could not have stolen you could not have stolen he could not have stolen we could not have stolen you could not have stolen they could not have stolen
V-ing perfect
I could not have been stealing you could not have been stealing he could not have been stealing we could not have been stealing you could not have been stealing they could not have been stealing
Interrogative form
Simple form
could I steal? could you steal? could he steal? could we steal? could you steal? could they steal?
V-ing form
could I be stealing? could you be stealing? could he be stealing? could we be stealing? could you be stealing? could they be stealing?
Perfect
could I have stolen? could you have stolen? could he have stolen? could we have stolen? could you have stolen? could they have stolen?
V-ing perfect
could I have been stealing? could you have been stealing? could he have been stealing? could we have been stealing? could you have been stealing? could they have been stealing?
Interro-negative form
Simple form
could I not steal? could you not steal? could he not steal? could we not steal? could you not steal? could they not steal?
V-ing form
could I not be stealing? could you not be stealing? could he not be stealing? could we not be stealing? could you not be stealing? could they not be stealing?
Perfect
could I not have stolen? could you not have stolen? could he not have stolen? could we not have stolen? could you not have stolen? could they not have stolen?
V-ing perfect
could I not have been stealing? could you not have been stealing? could he not have been stealing? could we not have been stealing? could you not have been stealing? could they not have been stealing?