I could range you could range he could range we could range you could range they could range
V-ing form
I could be ranging you could be ranging he could be ranging we could be ranging you could be ranging they could be ranging
Perfect
I could have ranged you could have ranged he could have ranged we could have ranged you could have ranged they could have ranged
V-ing perfect
I could have been ranging you could have been ranging he could have been ranging we could have been ranging you could have been ranging they could have been ranging
Negation
Simple form
I could not range you could not range he could not range we could not range you could not range they could not range
V-ing form
I could not be ranging you could not be ranging he could not be ranging we could not be ranging you could not be ranging they could not be ranging
Perfect
I could not have ranged you could not have ranged he could not have ranged we could not have ranged you could not have ranged they could not have ranged
V-ing perfect
I could not have been ranging you could not have been ranging he could not have been ranging we could not have been ranging you could not have been ranging they could not have been ranging
Interrogative form
Simple form
could I range? could you range? could he range? could we range? could you range? could they range?
V-ing form
could I be ranging? could you be ranging? could he be ranging? could we be ranging? could you be ranging? could they be ranging?
Perfect
could I have ranged? could you have ranged? could he have ranged? could we have ranged? could you have ranged? could they have ranged?
V-ing perfect
could I have been ranging? could you have been ranging? could he have been ranging? could we have been ranging? could you have been ranging? could they have been ranging?
Interro-negative form
Simple form
could I not range? could you not range? could he not range? could we not range? could you not range? could they not range?
V-ing form
could I not be ranging? could you not be ranging? could he not be ranging? could we not be ranging? could you not be ranging? could they not be ranging?
Perfect
could I not have ranged? could you not have ranged? could he not have ranged? could we not have ranged? could you not have ranged? could they not have ranged?
V-ing perfect
could I not have been ranging? could you not have been ranging? could he not have been ranging? could we not have been ranging? could you not have been ranging? could they not have been ranging?