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 couldn't range you couldn't range he couldn't range we couldn't range you couldn't range they couldn't range
V-ing form
I couldn't be ranging you couldn't be ranging he couldn't be ranging we couldn't be ranging you couldn't be ranging they couldn't be ranging
Perfect
I couldn't have ranged you couldn't have ranged he couldn't have ranged we couldn't have ranged you couldn't have ranged they couldn't have ranged
V-ing perfect
I couldn't have been ranging you couldn't have been ranging he couldn't have been ranging we couldn't have been ranging you couldn't have been ranging they couldn't 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
couldn't I range? couldn't you range? couldn't he range? couldn't we range? couldn't you range? couldn't they range?
V-ing form
couldn't I be ranging? couldn't you be ranging? couldn't he be ranging? couldn't we be ranging? couldn't you be ranging? couldn't they be ranging?
Perfect
couldn't I have ranged? couldn't you have ranged? couldn't he have ranged? couldn't we have ranged? couldn't you have ranged? couldn't they have ranged?
V-ing perfect
couldn't I have been ranging? couldn't you have been ranging? couldn't he have been ranging? couldn't we have been ranging? couldn't you have been ranging? couldn't they have been ranging?