I can regenerate you can regenerate he can regenerate we can regenerate you can regenerate they can regenerate
V-ing form
I can be regenerating you can be regenerating he can be regenerating we can be regenerating you can be regenerating they can be regenerating
Perfect
I can have regenerated you can have regenerated he can have regenerated we can have regenerated you can have regenerated they can have regenerated
V-ing perfect
I can have been regenerating you can have been regenerating he can have been regenerating we can have been regenerating you can have been regenerating they can have been regenerating
Negation
Simple form
I can't regenerate you can't regenerate he can't regenerate we can't regenerate you can't regenerate they can't regenerate
V-ing form
I can't be regenerating you can't be regenerating he can't be regenerating we can't be regenerating you can't be regenerating they can't be regenerating
Perfect
I can't have regenerated you can't have regenerated he can't have regenerated we can't have regenerated you can't have regenerated they can't have regenerated
V-ing perfect
I can't have been regenerating you can't have been regenerating he can't have been regenerating we can't have been regenerating you can't have been regenerating they can't have been regenerating
Interrogative form
Simple form
can I regenerate? can you regenerate? can he regenerate? can we regenerate? can you regenerate? can they regenerate?
V-ing form
can I be regenerating? can you be regenerating? can he be regenerating? can we be regenerating? can you be regenerating? can they be regenerating?
Perfect
can I have regenerated? can you have regenerated? can he have regenerated? can we have regenerated? can you have regenerated? can they have regenerated?
V-ing perfect
can I have been regenerating? can you have been regenerating? can he have been regenerating? can we have been regenerating? can you have been regenerating? can they have been regenerating?
Interro-negative form
Simple form
can't I regenerate? can't you regenerate? can't he regenerate? can't we regenerate? can't you regenerate? can't they regenerate?
V-ing form
can't I be regenerating? can't you be regenerating? can't he be regenerating? can't we be regenerating? can't you be regenerating? can't they be regenerating?
Perfect
can't I have regenerated? can't you have regenerated? can't he have regenerated? can't we have regenerated? can't you have regenerated? can't they have regenerated?
V-ing perfect
can't I have been regenerating? can't you have been regenerating? can't he have been regenerating? can't we have been regenerating? can't you have been regenerating? can't they have been regenerating?