English verb conjugation
COULD STAY

Regular verb: stay - stayed - stayed

Affirmation

Simple form	V-ing form
I could stay you could stay she could stay we could stay you could stay they could stay	I could be staying you could be staying she could be staying we could be staying you could be staying they could be staying
Perfect	V-ing perfect
I could have stayed you could have stayed she could have stayed we could have stayed you could have stayed they could have stayed	I could have been staying you could have been staying she could have been staying we could have been staying you could have been staying they could have been staying

Negation

Simple form	V-ing form
I could not stay you could not stay she could not stay we could not stay you could not stay they could not stay	I could not be staying you could not be staying she could not be staying we could not be staying you could not be staying they could not be staying
Perfect	V-ing perfect
I could not have stayed you could not have stayed she could not have stayed we could not have stayed you could not have stayed they could not have stayed	I could not have been staying you could not have been staying she could not have been staying we could not have been staying you could not have been staying they could not have been staying

Interrogative form

Simple form	V-ing form
could I stay? could you stay? could she stay? could we stay? could you stay? could they stay?	could I be staying? could you be staying? could she be staying? could we be staying? could you be staying? could they be staying?
Perfect	V-ing perfect
could I have stayed? could you have stayed? could she have stayed? could we have stayed? could you have stayed? could they have stayed?	could I have been staying? could you have been staying? could she have been staying? could we have been staying? could you have been staying? could they have been staying?

Interro-negative form

Simple form	V-ing form
could I not stay? could you not stay? could she not stay? could we not stay? could you not stay? could they not stay?	could I not be staying? could you not be staying? could she not be staying? could we not be staying? could you not be staying? could they not be staying?
Perfect	V-ing perfect
could I not have stayed? could you not have stayed? could she not have stayed? could we not have stayed? could you not have stayed? could they not have stayed?	could I not have been staying? could you not have been staying? could she not have been staying? could we not have been staying? could you not have been staying? could they not have been staying?