English verb conjugation
COULD RICHEN

Regular verb: richen - richened - richened

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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