I can ripen you can ripen she can ripen we can ripen you can ripen they can ripen
V-ing form
I can be ripening you can be ripening she can be ripening we can be ripening you can be ripening they can be ripening
Perfect
I can have ripened you can have ripened she can have ripened we can have ripened you can have ripened they can have ripened
V-ing perfect
I can have been ripening you can have been ripening she can have been ripening we can have been ripening you can have been ripening they can have been ripening
Negation
Simple form
I cannot ripen you cannot ripen she cannot ripen we cannot ripen you cannot ripen they cannot ripen
V-ing form
I cannot be ripening you cannot be ripening she cannot be ripening we cannot be ripening you cannot be ripening they cannot be ripening
Perfect
I cannot have ripened you cannot have ripened she cannot have ripened we cannot have ripened you cannot have ripened they cannot have ripened
V-ing perfect
I cannot have been ripening you cannot have been ripening she cannot have been ripening we cannot have been ripening you cannot have been ripening they cannot have been ripening
Interrogative form
Simple form
can I ripen? can you ripen? can she ripen? can we ripen? can you ripen? can they ripen?
V-ing form
can I be ripening? can you be ripening? can she be ripening? can we be ripening? can you be ripening? can they be ripening?
Perfect
can I have ripened? can you have ripened? can she have ripened? can we have ripened? can you have ripened? can they have ripened?
V-ing perfect
can I have been ripening? can you have been ripening? can she have been ripening? can we have been ripening? can you have been ripening? can they have been ripening?
Interro-negative form
Simple form
can I not ripen? can you not ripen? can she not ripen? can we not ripen? can you not ripen? can they not ripen?
V-ing form
can I not be ripening? can you not be ripening? can she not be ripening? can we not be ripening? can you not be ripening? can they not be ripening?
Perfect
can I not have ripened? can you not have ripened? can she not have ripened? can we not have ripened? can you not have ripened? can they not have ripened?
V-ing perfect
can I not have been ripening? can you not have been ripening? can she not have been ripening? can we not have been ripening? can you not have been ripening? can they not have been ripening?