English verb conjugation
CAN YAP

Regular verb: yap - yapped - yapped

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I can't yap you can't yap she can't yap we can't yap you can't yap they can't yap	I can't be yapping you can't be yapping she can't be yapping we can't be yapping you can't be yapping they can't be yapping
Perfect	V-ing perfect
I can't have yapped you can't have yapped she can't have yapped we can't have yapped you can't have yapped they can't have yapped	I can't have been yapping you can't have been yapping she can't have been yapping we can't have been yapping you can't have been yapping they can't have been yapping

Interrogative form

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