English verb conjugation
MUST PROFFER

Regular verb: proffer - proffered - proffered

Affirmation

Simple form	V-ing form
I must proffer you must proffer he must proffer we must proffer you must proffer they must proffer	I must be proffering you must be proffering he must be proffering we must be proffering you must be proffering they must be proffering
Perfect	V-ing perfect
I must have proffered you must have proffered he must have proffered we must have proffered you must have proffered they must have proffered	I must have been proffering you must have been proffering he must have been proffering we must have been proffering you must have been proffering they must have been proffering

Negation

Simple form	V-ing form
I mustn't proffer you mustn't proffer he mustn't proffer we mustn't proffer you mustn't proffer they mustn't proffer	I mustn't be proffering you mustn't be proffering he mustn't be proffering we mustn't be proffering you mustn't be proffering they mustn't be proffering
Perfect	V-ing perfect
I mustn't have proffered you mustn't have proffered he mustn't have proffered we mustn't have proffered you mustn't have proffered they mustn't have proffered	I mustn't have been proffering you mustn't have been proffering he mustn't have been proffering we mustn't have been proffering you mustn't have been proffering they mustn't have been proffering

Interrogative form

Simple form	V-ing form
must I proffer? must you proffer? must he proffer? must we proffer? must you proffer? must they proffer?	must I be proffering? must you be proffering? must he be proffering? must we be proffering? must you be proffering? must they be proffering?
Perfect	V-ing perfect
must I have proffered? must you have proffered? must he have proffered? must we have proffered? must you have proffered? must they have proffered?	must I have been proffering? must you have been proffering? must he have been proffering? must we have been proffering? must you have been proffering? must they have been proffering?

Interro-negative form

Simple form	V-ing form
mustn't I proffer? mustn't you proffer? mustn't he proffer? mustn't we proffer? mustn't you proffer? mustn't they proffer?	mustn't I be proffering? mustn't you be proffering? mustn't he be proffering? mustn't we be proffering? mustn't you be proffering? mustn't they be proffering?
Perfect	V-ing perfect
mustn't I have proffered? mustn't you have proffered? mustn't he have proffered? mustn't we have proffered? mustn't you have proffered? mustn't they have proffered?	mustn't I have been proffering? mustn't you have been proffering? mustn't he have been proffering? mustn't we have been proffering? mustn't you have been proffering? mustn't they have been proffering?