English verb conjugation
COULD OBSCURE

Regular verb: obscure - obscured - obscured

Affirmation

Simple form	V-ing form
I could obscure you could obscure he could obscure we could obscure you could obscure they could obscure	I could be obscuring you could be obscuring he could be obscuring we could be obscuring you could be obscuring they could be obscuring
Perfect	V-ing perfect
I could have obscured you could have obscured he could have obscured we could have obscured you could have obscured they could have obscured	I could have been obscuring you could have been obscuring he could have been obscuring we could have been obscuring you could have been obscuring they could have been obscuring

Negation

Simple form	V-ing form
I couldn't obscure you couldn't obscure he couldn't obscure we couldn't obscure you couldn't obscure they couldn't obscure	I couldn't be obscuring you couldn't be obscuring he couldn't be obscuring we couldn't be obscuring you couldn't be obscuring they couldn't be obscuring
Perfect	V-ing perfect
I couldn't have obscured you couldn't have obscured he couldn't have obscured we couldn't have obscured you couldn't have obscured they couldn't have obscured	I couldn't have been obscuring you couldn't have been obscuring he couldn't have been obscuring we couldn't have been obscuring you couldn't have been obscuring they couldn't have been obscuring

Interrogative form

Simple form	V-ing form
could I obscure? could you obscure? could he obscure? could we obscure? could you obscure? could they obscure?	could I be obscuring? could you be obscuring? could he be obscuring? could we be obscuring? could you be obscuring? could they be obscuring?
Perfect	V-ing perfect
could I have obscured? could you have obscured? could he have obscured? could we have obscured? could you have obscured? could they have obscured?	could I have been obscuring? could you have been obscuring? could he have been obscuring? could we have been obscuring? could you have been obscuring? could they have been obscuring?

Interro-negative form

Simple form	V-ing form
couldn't I obscure? couldn't you obscure? couldn't he obscure? couldn't we obscure? couldn't you obscure? couldn't they obscure?	couldn't I be obscuring? couldn't you be obscuring? couldn't he be obscuring? couldn't we be obscuring? couldn't you be obscuring? couldn't they be obscuring?
Perfect	V-ing perfect
couldn't I have obscured? couldn't you have obscured? couldn't he have obscured? couldn't we have obscured? couldn't you have obscured? couldn't they have obscured?	couldn't I have been obscuring? couldn't you have been obscuring? couldn't he have been obscuring? couldn't we have been obscuring? couldn't you have been obscuring? couldn't they have been obscuring?