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