can sleep
Irregular verb: sleep - slept- slept

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