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