English verb conjugation
COULD YOO-HOO

Regular verb: yoo-hoo - yoo-hooed - yoo-hooed

Affirmation

Simple form	V-ing form
I could yoo-hoo you could yoo-hoo he could yoo-hoo we could yoo-hoo you could yoo-hoo they could yoo-hoo	I could be yoo-hooing you could be yoo-hooing he could be yoo-hooing we could be yoo-hooing you could be yoo-hooing they could be yoo-hooing
Perfect	V-ing perfect
I could have yoo-hooed you could have yoo-hooed he could have yoo-hooed we could have yoo-hooed you could have yoo-hooed they could have yoo-hooed	I could have been yoo-hooing you could have been yoo-hooing he could have been yoo-hooing we could have been yoo-hooing you could have been yoo-hooing they could have been yoo-hooing

Negation

Simple form	V-ing form
I could not yoo-hoo you could not yoo-hoo he could not yoo-hoo we could not yoo-hoo you could not yoo-hoo they could not yoo-hoo	I could not be yoo-hooing you could not be yoo-hooing he could not be yoo-hooing we could not be yoo-hooing you could not be yoo-hooing they could not be yoo-hooing
Perfect	V-ing perfect
I could not have yoo-hooed you could not have yoo-hooed he could not have yoo-hooed we could not have yoo-hooed you could not have yoo-hooed they could not have yoo-hooed	I could not have been yoo-hooing you could not have been yoo-hooing he could not have been yoo-hooing we could not have been yoo-hooing you could not have been yoo-hooing they could not have been yoo-hooing

Interrogative form

Simple form	V-ing form
could I yoo-hoo? could you yoo-hoo? could he yoo-hoo? could we yoo-hoo? could you yoo-hoo? could they yoo-hoo?	could I be yoo-hooing? could you be yoo-hooing? could he be yoo-hooing? could we be yoo-hooing? could you be yoo-hooing? could they be yoo-hooing?
Perfect	V-ing perfect
could I have yoo-hooed? could you have yoo-hooed? could he have yoo-hooed? could we have yoo-hooed? could you have yoo-hooed? could they have yoo-hooed?	could I have been yoo-hooing? could you have been yoo-hooing? could he have been yoo-hooing? could we have been yoo-hooing? could you have been yoo-hooing? could they have been yoo-hooing?

Interro-negative form

Simple form	V-ing form
could I not yoo-hoo? could you not yoo-hoo? could he not yoo-hoo? could we not yoo-hoo? could you not yoo-hoo? could they not yoo-hoo?	could I not be yoo-hooing? could you not be yoo-hooing? could he not be yoo-hooing? could we not be yoo-hooing? could you not be yoo-hooing? could they not be yoo-hooing?
Perfect	V-ing perfect
could I not have yoo-hooed? could you not have yoo-hooed? could he not have yoo-hooed? could we not have yoo-hooed? could you not have yoo-hooed? could they not have yoo-hooed?	could I not have been yoo-hooing? could you not have been yoo-hooing? could he not have been yoo-hooing? could we not have been yoo-hooing? could you not have been yoo-hooing? could they not have been yoo-hooing?