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