English verb conjugation
MUST RICHEN

Regular verb: richen - richened - richened

Affirmation

Simple form	V-ing form
I must richen you must richen he must richen we must richen you must richen they must richen	I must be richening you must be richening he must be richening we must be richening you must be richening they must be richening
Perfect	V-ing perfect
I must have richened you must have richened he must have richened we must have richened you must have richened they must have richened	I must have been richening you must have been richening he must have been richening we must have been richening you must have been richening they must have been richening

Negation

Simple form	V-ing form
I must not richen you must not richen he must not richen we must not richen you must not richen they must not richen	I must not be richening you must not be richening he must not be richening we must not be richening you must not be richening they must not be richening
Perfect	V-ing perfect
I must not have richened you must not have richened he must not have richened we must not have richened you must not have richened they must not have richened	I must not have been richening you must not have been richening he must not have been richening we must not have been richening you must not have been richening they must not have been richening

Interrogative form

Simple form	V-ing form
must I richen? must you richen? must he richen? must we richen? must you richen? must they richen?	must I be richening? must you be richening? must he be richening? must we be richening? must you be richening? must they be richening?
Perfect	V-ing perfect
must I have richened? must you have richened? must he have richened? must we have richened? must you have richened? must they have richened?	must I have been richening? must you have been richening? must he have been richening? must we have been richening? must you have been richening? must they have been richening?

Interro-negative form

Simple form	V-ing form
must I not richen? must you not richen? must he not richen? must we not richen? must you not richen? must they not richen?	must I not be richening? must you not be richening? must he not be richening? must we not be richening? must you not be richening? must they not be richening?
Perfect	V-ing perfect
must I not have richened? must you not have richened? must he not have richened? must we not have richened? must you not have richened? must they not have richened?	must I not have been richening? must you not have been richening? must he not have been richening? must we not have been richening? must you not have been richening? must they not have been richening?