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