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 can't yap you can't yap he 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 he 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 he 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 he 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 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't I yap? can't you yap? can't he 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 he 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 he 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 he have been yapping? can't we have been yapping? can't you have been yapping? can't they have been yapping?