could yodel
Regular verb: yodel - yodelled- yodelled

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