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 cannot regenerate you cannot regenerate he cannot regenerate we cannot regenerate you cannot regenerate they cannot regenerate
V-ing form
I cannot be regenerating you cannot be regenerating he cannot be regenerating we cannot be regenerating you cannot be regenerating they cannot be regenerating
Perfect
I cannot have regenerated you cannot have regenerated he cannot have regenerated we cannot have regenerated you cannot have regenerated they cannot have regenerated
V-ing perfect
I cannot have been regenerating you cannot have been regenerating he cannot have been regenerating we cannot have been regenerating you cannot have been regenerating they cannot 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 I not regenerate? can you not regenerate? can he not regenerate? can we not regenerate? can you not regenerate? can they not regenerate?
V-ing form
can I not be regenerating? can you not be regenerating? can he not be regenerating? can we not be regenerating? can you not be regenerating? can they not be regenerating?
Perfect
can I not have regenerated? can you not have regenerated? can he not have regenerated? can we not have regenerated? can you not have regenerated? can they not have regenerated?
V-ing perfect
can I not have been regenerating? can you not have been regenerating? can he not have been regenerating? can we not have been regenerating? can you not have been regenerating? can they not have been regenerating?