I can perish you can perish he can perish we can perish you can perish they can perish
V-ing form
I can be perishing you can be perishing he can be perishing we can be perishing you can be perishing they can be perishing
Perfect
I can have perished you can have perished he can have perished we can have perished you can have perished they can have perished
V-ing perfect
I can have been perishing you can have been perishing he can have been perishing we can have been perishing you can have been perishing they can have been perishing
Negation
Simple form
I can't perish you can't perish he can't perish we can't perish you can't perish they can't perish
V-ing form
I can't be perishing you can't be perishing he can't be perishing we can't be perishing you can't be perishing they can't be perishing
Perfect
I can't have perished you can't have perished he can't have perished we can't have perished you can't have perished they can't have perished
V-ing perfect
I can't have been perishing you can't have been perishing he can't have been perishing we can't have been perishing you can't have been perishing they can't have been perishing
Interrogative form
Simple form
can I perish? can you perish? can he perish? can we perish? can you perish? can they perish?
V-ing form
can I be perishing? can you be perishing? can he be perishing? can we be perishing? can you be perishing? can they be perishing?
Perfect
can I have perished? can you have perished? can he have perished? can we have perished? can you have perished? can they have perished?
V-ing perfect
can I have been perishing? can you have been perishing? can he have been perishing? can we have been perishing? can you have been perishing? can they have been perishing?
Interro-negative form
Simple form
can't I perish? can't you perish? can't he perish? can't we perish? can't you perish? can't they perish?
V-ing form
can't I be perishing? can't you be perishing? can't he be perishing? can't we be perishing? can't you be perishing? can't they be perishing?
Perfect
can't I have perished? can't you have perished? can't he have perished? can't we have perished? can't you have perished? can't they have perished?
V-ing perfect
can't I have been perishing? can't you have been perishing? can't he have been perishing? can't we have been perishing? can't you have been perishing? can't they have been perishing?