English verb conjugation
COULD QUAVER

Regular verb: quaver - quavered - quavered

Affirmation

Simple form	V-ing form
I could quaver you could quaver he could quaver we could quaver you could quaver they could quaver	I could be quavering you could be quavering he could be quavering we could be quavering you could be quavering they could be quavering
Perfect	V-ing perfect
I could have quavered you could have quavered he could have quavered we could have quavered you could have quavered they could have quavered	I could have been quavering you could have been quavering he could have been quavering we could have been quavering you could have been quavering they could have been quavering

Negation

Simple form	V-ing form
I could not quaver you could not quaver he could not quaver we could not quaver you could not quaver they could not quaver	I could not be quavering you could not be quavering he could not be quavering we could not be quavering you could not be quavering they could not be quavering
Perfect	V-ing perfect
I could not have quavered you could not have quavered he could not have quavered we could not have quavered you could not have quavered they could not have quavered	I could not have been quavering you could not have been quavering he could not have been quavering we could not have been quavering you could not have been quavering they could not have been quavering

Interrogative form

Simple form	V-ing form
could I quaver? could you quaver? could he quaver? could we quaver? could you quaver? could they quaver?	could I be quavering? could you be quavering? could he be quavering? could we be quavering? could you be quavering? could they be quavering?
Perfect	V-ing perfect
could I have quavered? could you have quavered? could he have quavered? could we have quavered? could you have quavered? could they have quavered?	could I have been quavering? could you have been quavering? could he have been quavering? could we have been quavering? could you have been quavering? could they have been quavering?

Interro-negative form

Simple form	V-ing form
could I not quaver? could you not quaver? could he not quaver? could we not quaver? could you not quaver? could they not quaver?	could I not be quavering? could you not be quavering? could he not be quavering? could we not be quavering? could you not be quavering? could they not be quavering?
Perfect	V-ing perfect
could I not have quavered? could you not have quavered? could he not have quavered? could we not have quavered? could you not have quavered? could they not have quavered?	could I not have been quavering? could you not have been quavering? could he not have been quavering? could we not have been quavering? could you not have been quavering? could they not have been quavering?