English verb conjugation
COULD YACKETY-YAK

Regular verb: yackety-yak - yackety-yaked - yackety-yaked

Affirmation

Simple form	V-ing form
I could yackety-yak you could yackety-yak she could yackety-yak we could yackety-yak you could yackety-yak they could yackety-yak	I could be yackety-yaking you could be yackety-yaking she could be yackety-yaking we could be yackety-yaking you could be yackety-yaking they could be yackety-yaking
Perfect	V-ing perfect
I could have yackety-yaked you could have yackety-yaked she could have yackety-yaked we could have yackety-yaked you could have yackety-yaked they could have yackety-yaked	I could have been yackety-yaking you could have been yackety-yaking she could have been yackety-yaking we could have been yackety-yaking you could have been yackety-yaking they could have been yackety-yaking

Negation

Simple form	V-ing form
I could not yackety-yak you could not yackety-yak she could not yackety-yak we could not yackety-yak you could not yackety-yak they could not yackety-yak	I could not be yackety-yaking you could not be yackety-yaking she could not be yackety-yaking we could not be yackety-yaking you could not be yackety-yaking they could not be yackety-yaking
Perfect	V-ing perfect
I could not have yackety-yaked you could not have yackety-yaked she could not have yackety-yaked we could not have yackety-yaked you could not have yackety-yaked they could not have yackety-yaked	I could not have been yackety-yaking you could not have been yackety-yaking she could not have been yackety-yaking we could not have been yackety-yaking you could not have been yackety-yaking they could not have been yackety-yaking

Interrogative form

Simple form	V-ing form
could I yackety-yak? could you yackety-yak? could she yackety-yak? could we yackety-yak? could you yackety-yak? could they yackety-yak?	could I be yackety-yaking? could you be yackety-yaking? could she be yackety-yaking? could we be yackety-yaking? could you be yackety-yaking? could they be yackety-yaking?
Perfect	V-ing perfect
could I have yackety-yaked? could you have yackety-yaked? could she have yackety-yaked? could we have yackety-yaked? could you have yackety-yaked? could they have yackety-yaked?	could I have been yackety-yaking? could you have been yackety-yaking? could she have been yackety-yaking? could we have been yackety-yaking? could you have been yackety-yaking? could they have been yackety-yaking?

Interro-negative form

Simple form	V-ing form
could I not yackety-yak? could you not yackety-yak? could she not yackety-yak? could we not yackety-yak? could you not yackety-yak? could they not yackety-yak?	could I not be yackety-yaking? could you not be yackety-yaking? could she not be yackety-yaking? could we not be yackety-yaking? could you not be yackety-yaking? could they not be yackety-yaking?
Perfect	V-ing perfect
could I not have yackety-yaked? could you not have yackety-yaked? could she not have yackety-yaked? could we not have yackety-yaked? could you not have yackety-yaked? could they not have yackety-yaked?	could I not have been yackety-yaking? could you not have been yackety-yaking? could she not have been yackety-yaking? could we not have been yackety-yaking? could you not have been yackety-yaking? could they not have been yackety-yaking?