could befog
Regular verb: befog - befoged- befoged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could befog
you could befog
she could befog
we could befog
you could befog
they could befog 	I could be befoging
you could be befoging
she could be befoging
we could be befoging
you could be befoging
they could be befoging	I could have befoged
you could have befoged
she could have befoged
we could have befoged
you could have befoged
they could have befoged	I could have been befoging
you could have been befoging
she could have been befoging
we could have been befoging
you could have been befoging
they could have been befoging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't befog
you couldn't befog
she couldn't befog
we couldn't befog
you couldn't befog
they couldn't befog 	I couldn't be befoging
you couldn't be befoging
she couldn't be befoging
we couldn't be befoging
you couldn't be befoging
they couldn't be befoging	I couldn't have befoged
you couldn't have befoged
she couldn't have befoged
we couldn't have befoged
you couldn't have befoged
they couldn't have befoged	I couldn't have been befoging
you couldn't have been befoging
she couldn't have been befoging
we couldn't have been befoging
you couldn't have been befoging
they couldn't have been befoging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I befog?
could you befog?
could she befog?
could we befog?
could you befog?
could they befog? 	could I be befoging?
could you be befoging?
could she be befoging?
could we be befoging?
could you be befoging?
could they be befoging? 	could I have befoged?
could you have befoged?
could she have befoged?
could we have befoged?
could you have befoged?
could they have befoged? 	could I have been befoging?
could you have been befoging?
could she have been befoging?
could we have been befoging?
could you have been befoging?
could they have been befoging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I befog?
couldn't you befog?
couldn't she befog?
couldn't we befog?
couldn't you befog?
couldn't they befog? 	couldn't I be befoging?
couldn't you be befoging?
couldn't she be befoging?
couldn't we be befoging?
couldn't you be befoging?
couldn't they be befoging? 	couldn't I have befoged?
couldn't you have befoged?
couldn't she have befoged?
couldn't we have befoged?
couldn't you have befoged?
couldn't they have befoged? 	couldn't I have been befoging?
couldn't you have been befoging?
couldn't she have been befoging?
couldn't we have been befoging?
couldn't you have been befoging?
couldn't they have been befoging?