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