I could republish you could republish he could republish we could republish you could republish they could republish
V-ing form
I could be republishing you could be republishing he could be republishing we could be republishing you could be republishing they could be republishing
Perfect
I could have republished you could have republished he could have republished we could have republished you could have republished they could have republished
V-ing perfect
I could have been republishing you could have been republishing he could have been republishing we could have been republishing you could have been republishing they could have been republishing
Negation
Simple form
I couldn't republish you couldn't republish he couldn't republish we couldn't republish you couldn't republish they couldn't republish
V-ing form
I couldn't be republishing you couldn't be republishing he couldn't be republishing we couldn't be republishing you couldn't be republishing they couldn't be republishing
Perfect
I couldn't have republished you couldn't have republished he couldn't have republished we couldn't have republished you couldn't have republished they couldn't have republished
V-ing perfect
I couldn't have been republishing you couldn't have been republishing he couldn't have been republishing we couldn't have been republishing you couldn't have been republishing they couldn't have been republishing
Interrogative form
Simple form
could I republish? could you republish? could he republish? could we republish? could you republish? could they republish?
V-ing form
could I be republishing? could you be republishing? could he be republishing? could we be republishing? could you be republishing? could they be republishing?
Perfect
could I have republished? could you have republished? could he have republished? could we have republished? could you have republished? could they have republished?
V-ing perfect
could I have been republishing? could you have been republishing? could he have been republishing? could we have been republishing? could you have been republishing? could they have been republishing?
Interro-negative form
Simple form
couldn't I republish? couldn't you republish? couldn't he republish? couldn't we republish? couldn't you republish? couldn't they republish?
V-ing form
couldn't I be republishing? couldn't you be republishing? couldn't he be republishing? couldn't we be republishing? couldn't you be republishing? couldn't they be republishing?
Perfect
couldn't I have republished? couldn't you have republished? couldn't he have republished? couldn't we have republished? couldn't you have republished? couldn't they have republished?
V-ing perfect
couldn't I have been republishing? couldn't you have been republishing? couldn't he have been republishing? couldn't we have been republishing? couldn't you have been republishing? couldn't they have been republishing?