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 couldn't yodel you couldn't yodel he couldn't yodel we couldn't yodel you couldn't yodel they couldn't yodel	I couldn't be yodelling you couldn't be yodelling he couldn't be yodelling we couldn't be yodelling you couldn't be yodelling they couldn't be yodelling
Perfect	V-ing perfect
I couldn't have yodelled you couldn't have yodelled he couldn't have yodelled we couldn't have yodelled you couldn't have yodelled they couldn't have yodelled	I couldn't have been yodelling you couldn't have been yodelling he couldn't have been yodelling we couldn't have been yodelling you couldn't have been yodelling they couldn't 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
couldn't I yodel? couldn't you yodel? couldn't he yodel? couldn't we yodel? couldn't you yodel? couldn't they yodel?	couldn't I be yodelling? couldn't you be yodelling? couldn't he be yodelling? couldn't we be yodelling? couldn't you be yodelling? couldn't they be yodelling?
Perfect	V-ing perfect
couldn't I have yodelled? couldn't you have yodelled? couldn't he have yodelled? couldn't we have yodelled? couldn't you have yodelled? couldn't they have yodelled?	couldn't I have been yodelling? couldn't you have been yodelling? couldn't he have been yodelling? couldn't we have been yodelling? couldn't you have been yodelling? couldn't they have been yodelling?