English verb conjugation
COULD OBSESS

Regular verb: obsess - obsessed - obsessed

Affirmation

Simple form	V-ing form
I could obsess you could obsess he could obsess we could obsess you could obsess they could obsess	I could be obsessing you could be obsessing he could be obsessing we could be obsessing you could be obsessing they could be obsessing
Perfect	V-ing perfect
I could have obsessed you could have obsessed he could have obsessed we could have obsessed you could have obsessed they could have obsessed	I could have been obsessing you could have been obsessing he could have been obsessing we could have been obsessing you could have been obsessing they could have been obsessing

Negation

Simple form	V-ing form
I couldn't obsess you couldn't obsess he couldn't obsess we couldn't obsess you couldn't obsess they couldn't obsess	I couldn't be obsessing you couldn't be obsessing he couldn't be obsessing we couldn't be obsessing you couldn't be obsessing they couldn't be obsessing
Perfect	V-ing perfect
I couldn't have obsessed you couldn't have obsessed he couldn't have obsessed we couldn't have obsessed you couldn't have obsessed they couldn't have obsessed	I couldn't have been obsessing you couldn't have been obsessing he couldn't have been obsessing we couldn't have been obsessing you couldn't have been obsessing they couldn't have been obsessing

Interrogative form

Simple form	V-ing form
could I obsess? could you obsess? could he obsess? could we obsess? could you obsess? could they obsess?	could I be obsessing? could you be obsessing? could he be obsessing? could we be obsessing? could you be obsessing? could they be obsessing?
Perfect	V-ing perfect
could I have obsessed? could you have obsessed? could he have obsessed? could we have obsessed? could you have obsessed? could they have obsessed?	could I have been obsessing? could you have been obsessing? could he have been obsessing? could we have been obsessing? could you have been obsessing? could they have been obsessing?

Interro-negative form

Simple form	V-ing form
couldn't I obsess? couldn't you obsess? couldn't he obsess? couldn't we obsess? couldn't you obsess? couldn't they obsess?	couldn't I be obsessing? couldn't you be obsessing? couldn't he be obsessing? couldn't we be obsessing? couldn't you be obsessing? couldn't they be obsessing?
Perfect	V-ing perfect
couldn't I have obsessed? couldn't you have obsessed? couldn't he have obsessed? couldn't we have obsessed? couldn't you have obsessed? couldn't they have obsessed?	couldn't I have been obsessing? couldn't you have been obsessing? couldn't he have been obsessing? couldn't we have been obsessing? couldn't you have been obsessing? couldn't they have been obsessing?