Coniugazione del verbo inglese
MUST STIFFEN

Verbo regolare: stiffen - stiffened - stiffened

Affermazione

Forma semplice	Forma con V-ing
I must stiffen you must stiffen he must stiffen we must stiffen you must stiffen they must stiffen	I must be stiffening you must be stiffening he must be stiffening we must be stiffening you must be stiffening they must be stiffening
Perfetto	Perfetto con V-ing
I must have stiffened you must have stiffened he must have stiffened we must have stiffened you must have stiffened they must have stiffened	I must have been stiffening you must have been stiffening he must have been stiffening we must have been stiffening you must have been stiffening they must have been stiffening

Negazione

Forma semplice	Forma con V-ing
I must not stiffen you must not stiffen he must not stiffen we must not stiffen you must not stiffen they must not stiffen	I must not be stiffening you must not be stiffening he must not be stiffening we must not be stiffening you must not be stiffening they must not be stiffening
Perfetto	Perfetto con V-ing
I must not have stiffened you must not have stiffened he must not have stiffened we must not have stiffened you must not have stiffened they must not have stiffened	I must not have been stiffening you must not have been stiffening he must not have been stiffening we must not have been stiffening you must not have been stiffening they must not have been stiffening

Forma interrogativa

Forma semplice	Forma con V-ing
must I stiffen? must you stiffen? must he stiffen? must we stiffen? must you stiffen? must they stiffen?	must I be stiffening? must you be stiffening? must he be stiffening? must we be stiffening? must you be stiffening? must they be stiffening?
Perfetto	Perfetto con V-ing
must I have stiffened? must you have stiffened? must he have stiffened? must we have stiffened? must you have stiffened? must they have stiffened?	must I have been stiffening? must you have been stiffening? must he have been stiffening? must we have been stiffening? must you have been stiffening? must they have been stiffening?

Forma interro-negativa

Forma semplice	Forma con V-ing
must I not stiffen? must you not stiffen? must he not stiffen? must we not stiffen? must you not stiffen? must they not stiffen?	must I not be stiffening? must you not be stiffening? must he not be stiffening? must we not be stiffening? must you not be stiffening? must they not be stiffening?
Perfetto	Perfetto con V-ing
must I not have stiffened? must you not have stiffened? must he not have stiffened? must we not have stiffened? must you not have stiffened? must they not have stiffened?	must I not have been stiffening? must you not have been stiffening? must he not have been stiffening? must we not have been stiffening? must you not have been stiffening? must they not have been stiffening?