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 can't befog you can't befog he can't befog we can't befog you can't befog they can't befog
V-ing form
I can't be befoging you can't be befoging he can't be befoging we can't be befoging you can't be befoging they can't be befoging
Perfect
I can't have befoged you can't have befoged he can't have befoged we can't have befoged you can't have befoged they can't have befoged
V-ing perfect
I can't have been befoging you can't have been befoging he can't have been befoging we can't have been befoging you can't have been befoging they can't 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't I befog? can't you befog? can't he befog? can't we befog? can't you befog? can't they befog?
V-ing form
can't I be befoging? can't you be befoging? can't he be befoging? can't we be befoging? can't you be befoging? can't they be befoging?
Perfect
can't I have befoged? can't you have befoged? can't he have befoged? can't we have befoged? can't you have befoged? can't they have befoged?
V-ing perfect
can't I have been befoging? can't you have been befoging? can't he have been befoging? can't we have been befoging? can't you have been befoging? can't they have been befoging?