English verb conjugation
COULD YAP YAP

Regular verb: yap yap - yap yaped - yap yaped

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I could yap yap you could yap yap he could yap yap we could yap yap you could yap yap they could yap yap	I could be yap yaping you could be yap yaping he could be yap yaping we could be yap yaping you could be yap yaping they could be yap yaping
Perfect	V-ing perfect
I could have yap yaped you could have yap yaped he could have yap yaped we could have yap yaped you could have yap yaped they could have yap yaped	I could have been yap yaping you could have been yap yaping he could have been yap yaping we could have been yap yaping you could have been yap yaping they could have been yap yaping

Negation

Simple form	V-ing form
I couldn't yap yap you couldn't yap yap he couldn't yap yap we couldn't yap yap you couldn't yap yap they couldn't yap yap	I couldn't be yap yaping you couldn't be yap yaping he couldn't be yap yaping we couldn't be yap yaping you couldn't be yap yaping they couldn't be yap yaping
Perfect	V-ing perfect
I couldn't have yap yaped you couldn't have yap yaped he couldn't have yap yaped we couldn't have yap yaped you couldn't have yap yaped they couldn't have yap yaped	I couldn't have been yap yaping you couldn't have been yap yaping he couldn't have been yap yaping we couldn't have been yap yaping you couldn't have been yap yaping they couldn't have been yap yaping

Interrogative form

Simple form	V-ing form
could I yap yap? could you yap yap? could he yap yap? could we yap yap? could you yap yap? could they yap yap?	could I be yap yaping? could you be yap yaping? could he be yap yaping? could we be yap yaping? could you be yap yaping? could they be yap yaping?
Perfect	V-ing perfect
could I have yap yaped? could you have yap yaped? could he have yap yaped? could we have yap yaped? could you have yap yaped? could they have yap yaped?	could I have been yap yaping? could you have been yap yaping? could he have been yap yaping? could we have been yap yaping? could you have been yap yaping? could they have been yap yaping?

Interro-negative form

Simple form	V-ing form
couldn't I yap yap? couldn't you yap yap? couldn't he yap yap? couldn't we yap yap? couldn't you yap yap? couldn't they yap yap?	couldn't I be yap yaping? couldn't you be yap yaping? couldn't he be yap yaping? couldn't we be yap yaping? couldn't you be yap yaping? couldn't they be yap yaping?
Perfect	V-ing perfect
couldn't I have yap yaped? couldn't you have yap yaped? couldn't he have yap yaped? couldn't we have yap yaped? couldn't you have yap yaped? couldn't they have yap yaped?	couldn't I have been yap yaping? couldn't you have been yap yaping? couldn't he have been yap yaping? couldn't we have been yap yaping? couldn't you have been yap yaping? couldn't they have been yap yaping?