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 couldn't quaver you couldn't quaver he couldn't quaver we couldn't quaver you couldn't quaver they couldn't quaver	I couldn't be quavering you couldn't be quavering he couldn't be quavering we couldn't be quavering you couldn't be quavering they couldn't be quavering
Perfect	V-ing perfect
I couldn't have quavered you couldn't have quavered he couldn't have quavered we couldn't have quavered you couldn't have quavered they couldn't have quavered	I couldn't have been quavering you couldn't have been quavering he couldn't have been quavering we couldn't have been quavering you couldn't have been quavering they couldn't 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
couldn't I quaver? couldn't you quaver? couldn't he quaver? couldn't we quaver? couldn't you quaver? couldn't they quaver?	couldn't I be quavering? couldn't you be quavering? couldn't he be quavering? couldn't we be quavering? couldn't you be quavering? couldn't they be quavering?
Perfect	V-ing perfect
couldn't I have quavered? couldn't you have quavered? couldn't he have quavered? couldn't we have quavered? couldn't you have quavered? couldn't they have quavered?	couldn't I have been quavering? couldn't you have been quavering? couldn't he have been quavering? couldn't we have been quavering? couldn't you have been quavering? couldn't they have been quavering?