English verb conjugation
MUST PROFFER

Regular verb: proffer - proffered - proffered

Affirmation

Simple form	V-ing form
I must proffer you must proffer she must proffer we must proffer you must proffer they must proffer	I must be proffering you must be proffering she 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 she 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 she 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 must not proffer you must not proffer she must not proffer we must not proffer you must not proffer they must not proffer	I must not be proffering you must not be proffering she must not be proffering we must not be proffering you must not be proffering they must not be proffering
Perfect	V-ing perfect
I must not have proffered you must not have proffered she must not have proffered we must not have proffered you must not have proffered they must not have proffered	I must not have been proffering you must not have been proffering she must not have been proffering we must not have been proffering you must not have been proffering they must not have been proffering

Interrogative form

Simple form	V-ing form
must I proffer? must you proffer? must she proffer? must we proffer? must you proffer? must they proffer?	must I be proffering? must you be proffering? must she 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 she 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 she 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
must I not proffer? must you not proffer? must she not proffer? must we not proffer? must you not proffer? must they not proffer?	must I not be proffering? must you not be proffering? must she not be proffering? must we not be proffering? must you not be proffering? must they not be proffering?
Perfect	V-ing perfect
must I not have proffered? must you not have proffered? must she not have proffered? must we not have proffered? must you not have proffered? must they not have proffered?	must I not have been proffering? must you not have been proffering? must she not have been proffering? must we not have been proffering? must you not have been proffering? must they not have been proffering?