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 cannot breathe you cannot breathe he cannot breathe we cannot breathe you cannot breathe they cannot breathe
V-ing form
I cannot be breathing you cannot be breathing he cannot be breathing we cannot be breathing you cannot be breathing they cannot be breathing
Perfect
I cannot have breathed you cannot have breathed he cannot have breathed we cannot have breathed you cannot have breathed they cannot have breathed
V-ing perfect
I cannot have been breathing you cannot have been breathing he cannot have been breathing we cannot have been breathing you cannot have been breathing they cannot 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 I not breathe? can you not breathe? can he not breathe? can we not breathe? can you not breathe? can they not breathe?
V-ing form
can I not be breathing? can you not be breathing? can he not be breathing? can we not be breathing? can you not be breathing? can they not be breathing?
Perfect
can I not have breathed? can you not have breathed? can he not have breathed? can we not have breathed? can you not have breathed? can they not have breathed?
V-ing perfect
can I not have been breathing? can you not have been breathing? can he not have been breathing? can we not have been breathing? can you not have been breathing? can they not have been breathing?