I can befog you can befog he can befog we can befog you can befog they can befog
V-ing form
I can be befoging you can be befoging he can be befoging we can be befoging you can be befoging they can be befoging
Perfect
I can have befoged you can have befoged he can have befoged we can have befoged you can have befoged they can have befoged
V-ing perfect
I can have been befoging you can have been befoging he can have been befoging we can have been befoging you can have been befoging they can have been befoging
Negation
Simple form
I cannot befog you cannot befog he cannot befog we cannot befog you cannot befog they cannot befog
V-ing form
I cannot be befoging you cannot be befoging he cannot be befoging we cannot be befoging you cannot be befoging they cannot be befoging
Perfect
I cannot have befoged you cannot have befoged he cannot have befoged we cannot have befoged you cannot have befoged they cannot have befoged
V-ing perfect
I cannot have been befoging you cannot have been befoging he cannot have been befoging we cannot have been befoging you cannot have been befoging they cannot have been befoging
Interrogative form
Simple form
can I befog? can you befog? can he befog? can we befog? can you befog? can they befog?
V-ing form
can I be befoging? can you be befoging? can he be befoging? can we be befoging? can you be befoging? can they be befoging?
Perfect
can I have befoged? can you have befoged? can he have befoged? can we have befoged? can you have befoged? can they have befoged?
V-ing perfect
can I have been befoging? can you have been befoging? can he have been befoging? can we have been befoging? can you have been befoging? can they have been befoging?
Interro-negative form
Simple form
can I not befog? can you not befog? can he not befog? can we not befog? can you not befog? can they not befog?
V-ing form
can I not be befoging? can you not be befoging? can he not be befoging? can we not be befoging? can you not be befoging? can they not be befoging?
Perfect
can I not have befoged? can you not have befoged? can he not have befoged? can we not have befoged? can you not have befoged? can they not have befoged?
V-ing perfect
can I not have been befoging? can you not have been befoging? can he not have been befoging? can we not have been befoging? can you not have been befoging? can they not have been befoging?