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