I could sellotape you could sellotape he could sellotape we could sellotape you could sellotape they could sellotape
V-ing form
I could be sellotaping you could be sellotaping he could be sellotaping we could be sellotaping you could be sellotaping they could be sellotaping
Perfect
I could have sellotaped you could have sellotaped he could have sellotaped we could have sellotaped you could have sellotaped they could have sellotaped
V-ing perfect
I could have been sellotaping you could have been sellotaping he could have been sellotaping we could have been sellotaping you could have been sellotaping they could have been sellotaping
Negation
Simple form
I could not sellotape you could not sellotape he could not sellotape we could not sellotape you could not sellotape they could not sellotape
V-ing form
I could not be sellotaping you could not be sellotaping he could not be sellotaping we could not be sellotaping you could not be sellotaping they could not be sellotaping
Perfect
I could not have sellotaped you could not have sellotaped he could not have sellotaped we could not have sellotaped you could not have sellotaped they could not have sellotaped
V-ing perfect
I could not have been sellotaping you could not have been sellotaping he could not have been sellotaping we could not have been sellotaping you could not have been sellotaping they could not have been sellotaping
Interrogative form
Simple form
could I sellotape? could you sellotape? could he sellotape? could we sellotape? could you sellotape? could they sellotape?
V-ing form
could I be sellotaping? could you be sellotaping? could he be sellotaping? could we be sellotaping? could you be sellotaping? could they be sellotaping?
Perfect
could I have sellotaped? could you have sellotaped? could he have sellotaped? could we have sellotaped? could you have sellotaped? could they have sellotaped?
V-ing perfect
could I have been sellotaping? could you have been sellotaping? could he have been sellotaping? could we have been sellotaping? could you have been sellotaping? could they have been sellotaping?
Interro-negative form
Simple form
could I not sellotape? could you not sellotape? could he not sellotape? could we not sellotape? could you not sellotape? could they not sellotape?
V-ing form
could I not be sellotaping? could you not be sellotaping? could he not be sellotaping? could we not be sellotaping? could you not be sellotaping? could they not be sellotaping?
Perfect
could I not have sellotaped? could you not have sellotaped? could he not have sellotaped? could we not have sellotaped? could you not have sellotaped? could they not have sellotaped?
V-ing perfect
could I not have been sellotaping? could you not have been sellotaping? could he not have been sellotaping? could we not have been sellotaping? could you not have been sellotaping? could they not have been sellotaping?