English verb conjugation
COULD SLEEP

Irregular verb: sleep - slept - slept

Affirmation

Simple form	V-ing form
I could sleep you could sleep she could sleep we could sleep you could sleep they could sleep	I could be sleeping you could be sleeping she could be sleeping we could be sleeping you could be sleeping they could be sleeping
Perfect	V-ing perfect
I could have slept you could have slept she could have slept we could have slept you could have slept they could have slept	I could have been sleeping you could have been sleeping she could have been sleeping we could have been sleeping you could have been sleeping they could have been sleeping

Negation

Simple form	V-ing form
I could not sleep you could not sleep she could not sleep we could not sleep you could not sleep they could not sleep	I could not be sleeping you could not be sleeping she could not be sleeping we could not be sleeping you could not be sleeping they could not be sleeping
Perfect	V-ing perfect
I could not have slept you could not have slept she could not have slept we could not have slept you could not have slept they could not have slept	I could not have been sleeping you could not have been sleeping she could not have been sleeping we could not have been sleeping you could not have been sleeping they could not have been sleeping

Interrogative form

Simple form	V-ing form
could I sleep? could you sleep? could she sleep? could we sleep? could you sleep? could they sleep?	could I be sleeping? could you be sleeping? could she be sleeping? could we be sleeping? could you be sleeping? could they be sleeping?
Perfect	V-ing perfect
could I have slept? could you have slept? could she have slept? could we have slept? could you have slept? could they have slept?	could I have been sleeping? could you have been sleeping? could she have been sleeping? could we have been sleeping? could you have been sleeping? could they have been sleeping?

Interro-negative form

Simple form	V-ing form
could I not sleep? could you not sleep? could she not sleep? could we not sleep? could you not sleep? could they not sleep?	could I not be sleeping? could you not be sleeping? could she not be sleeping? could we not be sleeping? could you not be sleeping? could they not be sleeping?
Perfect	V-ing perfect
could I not have slept? could you not have slept? could she not have slept? could we not have slept? could you not have slept? could they not have slept?	could I not have been sleeping? could you not have been sleeping? could she not have been sleeping? could we not have been sleeping? could you not have been sleeping? could they not have been sleeping?