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 could not obsess you could not obsess he could not obsess we could not obsess you could not obsess they could not obsess	I could not be obsessing you could not be obsessing he could not be obsessing we could not be obsessing you could not be obsessing they could not be obsessing
Perfect	V-ing perfect
I could not have obsessed you could not have obsessed he could not have obsessed we could not have obsessed you could not have obsessed they could not have obsessed	I could not have been obsessing you could not have been obsessing he could not have been obsessing we could not have been obsessing you could not have been obsessing they could not 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
could I not obsess? could you not obsess? could he not obsess? could we not obsess? could you not obsess? could they not obsess?	could I not be obsessing? could you not be obsessing? could he not be obsessing? could we not be obsessing? could you not be obsessing? could they not be obsessing?
Perfect	V-ing perfect
could I not have obsessed? could you not have obsessed? could he not have obsessed? could we not have obsessed? could you not have obsessed? could they not have obsessed?	could I not have been obsessing? could you not have been obsessing? could he not have been obsessing? could we not have been obsessing? could you not have been obsessing? could they not have been obsessing?