English verb conjugation
CAN YAP

Regular verb: yap - yapped - yapped

Affirmation

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