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 couldn't richen you couldn't richen he couldn't richen we couldn't richen you couldn't richen they couldn't richen	I couldn't be richening you couldn't be richening he couldn't be richening we couldn't be richening you couldn't be richening they couldn't be richening
Perfect	V-ing perfect
I couldn't have richened you couldn't have richened he couldn't have richened we couldn't have richened you couldn't have richened they couldn't have richened	I couldn't have been richening you couldn't have been richening he couldn't have been richening we couldn't have been richening you couldn't have been richening they couldn't 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
couldn't I richen? couldn't you richen? couldn't he richen? couldn't we richen? couldn't you richen? couldn't they richen?	couldn't I be richening? couldn't you be richening? couldn't he be richening? couldn't we be richening? couldn't you be richening? couldn't they be richening?
Perfect	V-ing perfect
couldn't I have richened? couldn't you have richened? couldn't he have richened? couldn't we have richened? couldn't you have richened? couldn't they have richened?	couldn't I have been richening? couldn't you have been richening? couldn't he have been richening? couldn't we have been richening? couldn't you have been richening? couldn't they have been richening?