could yodel
Regular verb: yodel - yodelled- yodelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?