can loop
Regular verb: loop - looped- looped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can loop
you can loop
she can loop
we can loop
you can loop
they can loop 	I can be looping
you can be looping
she can be looping
we can be looping
you can be looping
they can be looping	I can have looped
you can have looped
she can have looped
we can have looped
you can have looped
they can have looped	I can have been looping
you can have been looping
she can have been looping
we can have been looping
you can have been looping
they can have been looping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot loop
you cannot loop
she cannot loop
we cannot loop
you cannot loop
they cannot loop 	I cannot be looping
you cannot be looping
she cannot be looping
we cannot be looping
you cannot be looping
they cannot be looping	I cannot have looped
you cannot have looped
she cannot have looped
we cannot have looped
you cannot have looped
they cannot have looped	I cannot have been looping
you cannot have been looping
she cannot have been looping
we cannot have been looping
you cannot have been looping
they cannot have been looping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I loop?
can you loop?
can she loop?
can we loop?
can you loop?
can they loop? 	can I be looping?
can you be looping?
can she be looping?
can we be looping?
can you be looping?
can they be looping? 	can I have looped?
can you have looped?
can she have looped?
can we have looped?
can you have looped?
can they have looped? 	can I have been looping?
can you have been looping?
can she have been looping?
can we have been looping?
can you have been looping?
can they have been looping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not loop?
can you not loop?
can she not loop?
can we not loop?
can you not loop?
can they not loop? 	can I not be looping?
can you not be looping?
can she not be looping?
can we not be looping?
can you not be looping?
can they not be looping? 	can I not have looped?
can you not have looped?
can she not have looped?
can we not have looped?
can you not have looped?
can they not have looped? 	can I not have been looping?
can you not have been looping?
can she not have been looping?
can we not have been looping?
can you not have been looping?
can they not have been looping?