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 can't be you can't be she can't be we can't be you can't be they can't be
V-ing form
I can't be being you can't be being she can't be being we can't be being you can't be being they can't be being
Perfect
I can't have been you can't have been she can't have been we can't have been you can't have been they can't have been
V-ing perfect
I can't have been being you can't have been being she can't have been being we can't have been being you can't have been being they can't 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't I be? can't you be? can't she be? can't we be? can't you be? can't they be?
V-ing form
can't I be being? can't you be being? can't she be being? can't we be being? can't you be being? can't they be being?
Perfect
can't I have been? can't you have been? can't she have been? can't we have been? can't you have been? can't they have been?
V-ing perfect
can't I have been being? can't you have been being? can't she have been being? can't we have been being? can't you have been being? can't they have been being?