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 couldn't stripe you couldn't stripe he couldn't stripe we couldn't stripe you couldn't stripe they couldn't stripe
V-ing form
I couldn't be striping you couldn't be striping he couldn't be striping we couldn't be striping you couldn't be striping they couldn't be striping
Perfect
I couldn't have striped you couldn't have striped he couldn't have striped we couldn't have striped you couldn't have striped they couldn't have striped
V-ing perfect
I couldn't have been striping you couldn't have been striping he couldn't have been striping we couldn't have been striping you couldn't have been striping they couldn't 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
couldn't I stripe? couldn't you stripe? couldn't he stripe? couldn't we stripe? couldn't you stripe? couldn't they stripe?
V-ing form
couldn't I be striping? couldn't you be striping? couldn't he be striping? couldn't we be striping? couldn't you be striping? couldn't they be striping?
Perfect
couldn't I have striped? couldn't you have striped? couldn't he have striped? couldn't we have striped? couldn't you have striped? couldn't they have striped?
V-ing perfect
couldn't I have been striping? couldn't you have been striping? couldn't he have been striping? couldn't we have been striping? couldn't you have been striping? couldn't they have been striping?