I could stripe you could stripe he could stripe we could stripe you could stripe they could stripe
V-ing form
I could be striping you could be striping he could be striping we could be striping you could be striping they could be striping
Perfect
I could have striped you could have striped he could have striped we could have striped you could have striped they could have striped
V-ing perfect
I could have been striping you could have been striping he could have been striping we could have been striping you could have been striping they could have been striping
Negation
Simple form
I could not stripe you could not stripe he could not stripe we could not stripe you could not stripe they could not stripe
V-ing form
I could not be striping you could not be striping he could not be striping we could not be striping you could not be striping they could not be striping
Perfect
I could not have striped you could not have striped he could not have striped we could not have striped you could not have striped they could not have striped
V-ing perfect
I could not have been striping you could not have been striping he could not have been striping we could not have been striping you could not have been striping they could not have been striping
Interrogative form
Simple form
could I stripe? could you stripe? could he stripe? could we stripe? could you stripe? could they stripe?
V-ing form
could I be striping? could you be striping? could he be striping? could we be striping? could you be striping? could they be striping?
Perfect
could I have striped? could you have striped? could he have striped? could we have striped? could you have striped? could they have striped?
V-ing perfect
could I have been striping? could you have been striping? could he have been striping? could we have been striping? could you have been striping? could they have been striping?
Interro-negative form
Simple form
could I not stripe? could you not stripe? could he not stripe? could we not stripe? could you not stripe? could they not stripe?
V-ing form
could I not be striping? could you not be striping? could he not be striping? could we not be striping? could you not be striping? could they not be striping?
Perfect
could I not have striped? could you not have striped? could he not have striped? could we not have striped? could you not have striped? could they not have striped?
V-ing perfect
could I not have been striping? could you not have been striping? could he not have been striping? could we not have been striping? could you not have been striping? could they not have been striping?