English verb conjugation
COULD RIPEN

Regular verb: ripen - ripened - ripened

Affirmation

Simple form	V-ing form
I could ripen you could ripen he could ripen we could ripen you could ripen they could ripen	I could be ripening you could be ripening he could be ripening we could be ripening you could be ripening they could be ripening
Perfect	V-ing perfect
I could have ripened you could have ripened he could have ripened we could have ripened you could have ripened they could have ripened	I could have been ripening you could have been ripening he could have been ripening we could have been ripening you could have been ripening they could have been ripening

Negation

Simple form	V-ing form
I couldn't ripen you couldn't ripen he couldn't ripen we couldn't ripen you couldn't ripen they couldn't ripen	I couldn't be ripening you couldn't be ripening he couldn't be ripening we couldn't be ripening you couldn't be ripening they couldn't be ripening
Perfect	V-ing perfect
I couldn't have ripened you couldn't have ripened he couldn't have ripened we couldn't have ripened you couldn't have ripened they couldn't have ripened	I couldn't have been ripening you couldn't have been ripening he couldn't have been ripening we couldn't have been ripening you couldn't have been ripening they couldn't have been ripening

Interrogative form

Simple form	V-ing form
could I ripen? could you ripen? could he ripen? could we ripen? could you ripen? could they ripen?	could I be ripening? could you be ripening? could he be ripening? could we be ripening? could you be ripening? could they be ripening?
Perfect	V-ing perfect
could I have ripened? could you have ripened? could he have ripened? could we have ripened? could you have ripened? could they have ripened?	could I have been ripening? could you have been ripening? could he have been ripening? could we have been ripening? could you have been ripening? could they have been ripening?

Interro-negative form

Simple form	V-ing form
couldn't I ripen? couldn't you ripen? couldn't he ripen? couldn't we ripen? couldn't you ripen? couldn't they ripen?	couldn't I be ripening? couldn't you be ripening? couldn't he be ripening? couldn't we be ripening? couldn't you be ripening? couldn't they be ripening?
Perfect	V-ing perfect
couldn't I have ripened? couldn't you have ripened? couldn't he have ripened? couldn't we have ripened? couldn't you have ripened? couldn't they have ripened?	couldn't I have been ripening? couldn't you have been ripening? couldn't he have been ripening? couldn't we have been ripening? couldn't you have been ripening? couldn't they have been ripening?