English verb conjugation
COULD SPHERE

Regular verb: sphere - sphered - sphered

Affirmation

Simple form	V-ing form
I could sphere you could sphere he could sphere we could sphere you could sphere they could sphere	I could be sphering you could be sphering he could be sphering we could be sphering you could be sphering they could be sphering
Perfect	V-ing perfect
I could have sphered you could have sphered he could have sphered we could have sphered you could have sphered they could have sphered	I could have been sphering you could have been sphering he could have been sphering we could have been sphering you could have been sphering they could have been sphering

Negation

Simple form	V-ing form
I couldn't sphere you couldn't sphere he couldn't sphere we couldn't sphere you couldn't sphere they couldn't sphere	I couldn't be sphering you couldn't be sphering he couldn't be sphering we couldn't be sphering you couldn't be sphering they couldn't be sphering
Perfect	V-ing perfect
I couldn't have sphered you couldn't have sphered he couldn't have sphered we couldn't have sphered you couldn't have sphered they couldn't have sphered	I couldn't have been sphering you couldn't have been sphering he couldn't have been sphering we couldn't have been sphering you couldn't have been sphering they couldn't have been sphering

Interrogative form

Simple form	V-ing form
could I sphere? could you sphere? could he sphere? could we sphere? could you sphere? could they sphere?	could I be sphering? could you be sphering? could he be sphering? could we be sphering? could you be sphering? could they be sphering?
Perfect	V-ing perfect
could I have sphered? could you have sphered? could he have sphered? could we have sphered? could you have sphered? could they have sphered?	could I have been sphering? could you have been sphering? could he have been sphering? could we have been sphering? could you have been sphering? could they have been sphering?

Interro-negative form

Simple form	V-ing form
couldn't I sphere? couldn't you sphere? couldn't he sphere? couldn't we sphere? couldn't you sphere? couldn't they sphere?	couldn't I be sphering? couldn't you be sphering? couldn't he be sphering? couldn't we be sphering? couldn't you be sphering? couldn't they be sphering?
Perfect	V-ing perfect
couldn't I have sphered? couldn't you have sphered? couldn't he have sphered? couldn't we have sphered? couldn't you have sphered? couldn't they have sphered?	couldn't I have been sphering? couldn't you have been sphering? couldn't he have been sphering? couldn't we have been sphering? couldn't you have been sphering? couldn't they have been sphering?