can ripen
Regular verb: ripen - ripened- ripened

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