English verb conjugation
COULD YODEL

Regular verb: yodel - yodelled - yodelled

Affirmation

Simple form	V-ing form
I could yodel you could yodel he could yodel we could yodel you could yodel they could yodel	I could be yodelling you could be yodelling he could be yodelling we could be yodelling you could be yodelling they could be yodelling
Perfect	V-ing perfect
I could have yodelled you could have yodelled he could have yodelled we could have yodelled you could have yodelled they could have yodelled	I could have been yodelling you could have been yodelling he could have been yodelling we could have been yodelling you could have been yodelling they could have been yodelling

Negation

Simple form	V-ing form
I could not yodel you could not yodel he could not yodel we could not yodel you could not yodel they could not yodel	I could not be yodelling you could not be yodelling he could not be yodelling we could not be yodelling you could not be yodelling they could not be yodelling
Perfect	V-ing perfect
I could not have yodelled you could not have yodelled he could not have yodelled we could not have yodelled you could not have yodelled they could not have yodelled	I could not have been yodelling you could not have been yodelling he could not have been yodelling we could not have been yodelling you could not have been yodelling they could not have been yodelling

Interrogative form

Simple form	V-ing form
could I yodel? could you yodel? could he yodel? could we yodel? could you yodel? could they yodel?	could I be yodelling? could you be yodelling? could he be yodelling? could we be yodelling? could you be yodelling? could they be yodelling?
Perfect	V-ing perfect
could I have yodelled? could you have yodelled? could he have yodelled? could we have yodelled? could you have yodelled? could they have yodelled?	could I have been yodelling? could you have been yodelling? could he have been yodelling? could we have been yodelling? could you have been yodelling? could they have been yodelling?

Interro-negative form

Simple form	V-ing form
could I not yodel? could you not yodel? could he not yodel? could we not yodel? could you not yodel? could they not yodel?	could I not be yodelling? could you not be yodelling? could he not be yodelling? could we not be yodelling? could you not be yodelling? could they not be yodelling?
Perfect	V-ing perfect
could I not have yodelled? could you not have yodelled? could he not have yodelled? could we not have yodelled? could you not have yodelled? could they not have yodelled?	could I not have been yodelling? could you not have been yodelling? could he not have been yodelling? could we not have been yodelling? could you not have been yodelling? could they not have been yodelling?