English verb conjugation
CAN SLEEP

Irregular verb: sleep - slept - slept

Affirmation

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

Negation

Simple form	V-ing form
I cannot sleep you cannot sleep he cannot sleep we cannot sleep you cannot sleep they cannot sleep	I cannot be sleeping you cannot be sleeping he cannot be sleeping we cannot be sleeping you cannot be sleeping they cannot be sleeping
Perfect	V-ing perfect
I cannot have slept you cannot have slept he cannot have slept we cannot have slept you cannot have slept they cannot have slept	I cannot have been sleeping you cannot have been sleeping he cannot have been sleeping we cannot have been sleeping you cannot have been sleeping they cannot have been sleeping

Interrogative form

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

Interro-negative form

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