can yap
Regular verb: yap - yapped- yapped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can yap
you can yap
she can yap
we can yap
you can yap
they can yap 	I can be yapping
you can be yapping
she can be yapping
we can be yapping
you can be yapping
they can be yapping	I can have yapped
you can have yapped
she can have yapped
we can have yapped
you can have yapped
they can have yapped	I can have been yapping
you can have been yapping
she can have been yapping
we can have been yapping
you can have been yapping
they can have been yapping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot yap
you cannot yap
she cannot yap
we cannot yap
you cannot yap
they cannot yap 	I cannot be yapping
you cannot be yapping
she cannot be yapping
we cannot be yapping
you cannot be yapping
they cannot be yapping	I cannot have yapped
you cannot have yapped
she cannot have yapped
we cannot have yapped
you cannot have yapped
they cannot have yapped	I cannot have been yapping
you cannot have been yapping
she cannot have been yapping
we cannot have been yapping
you cannot have been yapping
they cannot have been yapping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I yap?
can you yap?
can she yap?
can we yap?
can you yap?
can they yap? 	can I be yapping?
can you be yapping?
can she be yapping?
can we be yapping?
can you be yapping?
can they be yapping? 	can I have yapped?
can you have yapped?
can she have yapped?
can we have yapped?
can you have yapped?
can they have yapped? 	can I have been yapping?
can you have been yapping?
can she have been yapping?
can we have been yapping?
can you have been yapping?
can they have been yapping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not yap?
can you not yap?
can she not yap?
can we not yap?
can you not yap?
can they not yap? 	can I not be yapping?
can you not be yapping?
can she not be yapping?
can we not be yapping?
can you not be yapping?
can they not be yapping? 	can I not have yapped?
can you not have yapped?
can she not have yapped?
can we not have yapped?
can you not have yapped?
can they not have yapped? 	can I not have been yapping?
can you not have been yapping?
can she not have been yapping?
can we not have been yapping?
can you not have been yapping?
can they not have been yapping?