English verb conjugation
CAN RIPEN

Regular verb: ripen - ripened - ripened

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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