I can frock you can frock he can frock we can frock you can frock they can frock
V-ing form
I can be frocking you can be frocking he can be frocking we can be frocking you can be frocking they can be frocking
Perfect
I can have frocked you can have frocked he can have frocked we can have frocked you can have frocked they can have frocked
V-ing perfect
I can have been frocking you can have been frocking he can have been frocking we can have been frocking you can have been frocking they can have been frocking
Negation
Simple form
I can't frock you can't frock he can't frock we can't frock you can't frock they can't frock
V-ing form
I can't be frocking you can't be frocking he can't be frocking we can't be frocking you can't be frocking they can't be frocking
Perfect
I can't have frocked you can't have frocked he can't have frocked we can't have frocked you can't have frocked they can't have frocked
V-ing perfect
I can't have been frocking you can't have been frocking he can't have been frocking we can't have been frocking you can't have been frocking they can't have been frocking
Interrogative form
Simple form
can I frock? can you frock? can he frock? can we frock? can you frock? can they frock?
V-ing form
can I be frocking? can you be frocking? can he be frocking? can we be frocking? can you be frocking? can they be frocking?
Perfect
can I have frocked? can you have frocked? can he have frocked? can we have frocked? can you have frocked? can they have frocked?
V-ing perfect
can I have been frocking? can you have been frocking? can he have been frocking? can we have been frocking? can you have been frocking? can they have been frocking?
Interro-negative form
Simple form
can't I frock? can't you frock? can't he frock? can't we frock? can't you frock? can't they frock?
V-ing form
can't I be frocking? can't you be frocking? can't he be frocking? can't we be frocking? can't you be frocking? can't they be frocking?
Perfect
can't I have frocked? can't you have frocked? can't he have frocked? can't we have frocked? can't you have frocked? can't they have frocked?
V-ing perfect
can't I have been frocking? can't you have been frocking? can't he have been frocking? can't we have been frocking? can't you have been frocking? can't they have been frocking?