English verb conjugation
COULD WALTZ

Regular verb: waltz - waltzed - waltzed

Affirmation

Simple form	V-ing form
I could waltz you could waltz he could waltz we could waltz you could waltz they could waltz	I could be waltzing you could be waltzing he could be waltzing we could be waltzing you could be waltzing they could be waltzing
Perfect	V-ing perfect
I could have waltzed you could have waltzed he could have waltzed we could have waltzed you could have waltzed they could have waltzed	I could have been waltzing you could have been waltzing he could have been waltzing we could have been waltzing you could have been waltzing they could have been waltzing

Negation

Simple form	V-ing form
I could not waltz you could not waltz he could not waltz we could not waltz you could not waltz they could not waltz	I could not be waltzing you could not be waltzing he could not be waltzing we could not be waltzing you could not be waltzing they could not be waltzing
Perfect	V-ing perfect
I could not have waltzed you could not have waltzed he could not have waltzed we could not have waltzed you could not have waltzed they could not have waltzed	I could not have been waltzing you could not have been waltzing he could not have been waltzing we could not have been waltzing you could not have been waltzing they could not have been waltzing

Interrogative form

Simple form	V-ing form
could I waltz? could you waltz? could he waltz? could we waltz? could you waltz? could they waltz?	could I be waltzing? could you be waltzing? could he be waltzing? could we be waltzing? could you be waltzing? could they be waltzing?
Perfect	V-ing perfect
could I have waltzed? could you have waltzed? could he have waltzed? could we have waltzed? could you have waltzed? could they have waltzed?	could I have been waltzing? could you have been waltzing? could he have been waltzing? could we have been waltzing? could you have been waltzing? could they have been waltzing?

Interro-negative form

Simple form	V-ing form
could I not waltz? could you not waltz? could he not waltz? could we not waltz? could you not waltz? could they not waltz?	could I not be waltzing? could you not be waltzing? could he not be waltzing? could we not be waltzing? could you not be waltzing? could they not be waltzing?
Perfect	V-ing perfect
could I not have waltzed? could you not have waltzed? could he not have waltzed? could we not have waltzed? could you not have waltzed? could they not have waltzed?	could I not have been waltzing? could you not have been waltzing? could he not have been waltzing? could we not have been waltzing? could you not have been waltzing? could they not have been waltzing?