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