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