Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could heavier you could heavier she could heavier we could heavier you could heavier they could heavier
V-ing form
I could be heaviering you could be heaviering she could be heaviering we could be heaviering you could be heaviering they could be heaviering
Perfect
I could have heaviered you could have heaviered she could have heaviered we could have heaviered you could have heaviered they could have heaviered
V-ing perfect
I could have been heaviering you could have been heaviering she could have been heaviering we could have been heaviering you could have been heaviering they could have been heaviering
Negation
Simple form
I could not heavier you could not heavier she could not heavier we could not heavier you could not heavier they could not heavier
V-ing form
I could not be heaviering you could not be heaviering she could not be heaviering we could not be heaviering you could not be heaviering they could not be heaviering
Perfect
I could not have heaviered you could not have heaviered she could not have heaviered we could not have heaviered you could not have heaviered they could not have heaviered
V-ing perfect
I could not have been heaviering you could not have been heaviering she could not have been heaviering we could not have been heaviering you could not have been heaviering they could not have been heaviering
Interrogative form
Simple form
could I heavier? could you heavier? could she heavier? could we heavier? could you heavier? could they heavier?
V-ing form
could I be heaviering? could you be heaviering? could she be heaviering? could we be heaviering? could you be heaviering? could they be heaviering?
Perfect
could I have heaviered? could you have heaviered? could she have heaviered? could we have heaviered? could you have heaviered? could they have heaviered?
V-ing perfect
could I have been heaviering? could you have been heaviering? could she have been heaviering? could we have been heaviering? could you have been heaviering? could they have been heaviering?
Interro-negative form
Simple form
could I not heavier? could you not heavier? could she not heavier? could we not heavier? could you not heavier? could they not heavier?
V-ing form
could I not be heaviering? could you not be heaviering? could she not be heaviering? could we not be heaviering? could you not be heaviering? could they not be heaviering?
Perfect
could I not have heaviered? could you not have heaviered? could she not have heaviered? could we not have heaviered? could you not have heaviered? could they not have heaviered?
V-ing perfect
could I not have been heaviering? could you not have been heaviering? could she not have been heaviering? could we not have been heaviering? could you not have been heaviering? could they not have been heaviering?