English verb conjugation
CAN RICHEN

Regular verb: richen - richened - richened

Affirmation

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

Negation

Simple form	V-ing form
I can't richen you can't richen he can't richen we can't richen you can't richen they can't richen	I can't be richening you can't be richening he can't be richening we can't be richening you can't be richening they can't be richening
Perfect	V-ing perfect
I can't have richened you can't have richened he can't have richened we can't have richened you can't have richened they can't have richened	I can't have been richening you can't have been richening he can't have been richening we can't have been richening you can't have been richening they can't have been richening

Interrogative form

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

Interro-negative form

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