I can breathe you can breathe he can breathe we can breathe you can breathe they can breathe
V-ing form
I can be breathing you can be breathing he can be breathing we can be breathing you can be breathing they can be breathing
Perfect
I can have breathed you can have breathed he can have breathed we can have breathed you can have breathed they can have breathed
V-ing perfect
I can have been breathing you can have been breathing he can have been breathing we can have been breathing you can have been breathing they can have been breathing
Negation
Simple form
I can't breathe you can't breathe he can't breathe we can't breathe you can't breathe they can't breathe
V-ing form
I can't be breathing you can't be breathing he can't be breathing we can't be breathing you can't be breathing they can't be breathing
Perfect
I can't have breathed you can't have breathed he can't have breathed we can't have breathed you can't have breathed they can't have breathed
V-ing perfect
I can't have been breathing you can't have been breathing he can't have been breathing we can't have been breathing you can't have been breathing they can't have been breathing
Interrogative form
Simple form
can I breathe? can you breathe? can he breathe? can we breathe? can you breathe? can they breathe?
V-ing form
can I be breathing? can you be breathing? can he be breathing? can we be breathing? can you be breathing? can they be breathing?
Perfect
can I have breathed? can you have breathed? can he have breathed? can we have breathed? can you have breathed? can they have breathed?
V-ing perfect
can I have been breathing? can you have been breathing? can he have been breathing? can we have been breathing? can you have been breathing? can they have been breathing?
Interro-negative form
Simple form
can't I breathe? can't you breathe? can't he breathe? can't we breathe? can't you breathe? can't they breathe?
V-ing form
can't I be breathing? can't you be breathing? can't he be breathing? can't we be breathing? can't you be breathing? can't they be breathing?
Perfect
can't I have breathed? can't you have breathed? can't he have breathed? can't we have breathed? can't you have breathed? can't they have breathed?
V-ing perfect
can't I have been breathing? can't you have been breathing? can't he have been breathing? can't we have been breathing? can't you have been breathing? can't they have been breathing?