English verb conjugation
COULD SLEEP

Irregular verb: sleep - slept - slept

Affirmation

Simple form	V-ing form
I could sleep you could sleep he could sleep we could sleep you could sleep they could sleep	I could be sleeping you could be sleeping he 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 he 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 he 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 couldn't sleep you couldn't sleep he couldn't sleep we couldn't sleep you couldn't sleep they couldn't sleep	I couldn't be sleeping you couldn't be sleeping he couldn't be sleeping we couldn't be sleeping you couldn't be sleeping they couldn't be sleeping
Perfect	V-ing perfect
I couldn't have slept you couldn't have slept he couldn't have slept we couldn't have slept you couldn't have slept they couldn't have slept	I couldn't have been sleeping you couldn't have been sleeping he couldn't have been sleeping we couldn't have been sleeping you couldn't have been sleeping they couldn't have been sleeping

Interrogative form

Simple form	V-ing form
could I sleep? could you sleep? could he sleep? could we sleep? could you sleep? could they sleep?	could I be sleeping? could you be sleeping? could he 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 he 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 he 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
couldn't I sleep? couldn't you sleep? couldn't he sleep? couldn't we sleep? couldn't you sleep? couldn't they sleep?	couldn't I be sleeping? couldn't you be sleeping? couldn't he be sleeping? couldn't we be sleeping? couldn't you be sleeping? couldn't they be sleeping?
Perfect	V-ing perfect
couldn't I have slept? couldn't you have slept? couldn't he have slept? couldn't we have slept? couldn't you have slept? couldn't they have slept?	couldn't I have been sleeping? couldn't you have been sleeping? couldn't he have been sleeping? couldn't we have been sleeping? couldn't you have been sleeping? couldn't they have been sleeping?