could berth
Regular verb: berth - berthed- berthed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could berth
you could berth
she could berth
we could berth
you could berth
they could berth 	I could be berthing
you could be berthing
she could be berthing
we could be berthing
you could be berthing
they could be berthing	I could have berthed
you could have berthed
she could have berthed
we could have berthed
you could have berthed
they could have berthed	I could have been berthing
you could have been berthing
she could have been berthing
we could have been berthing
you could have been berthing
they could have been berthing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't berth
you couldn't berth
she couldn't berth
we couldn't berth
you couldn't berth
they couldn't berth 	I couldn't be berthing
you couldn't be berthing
she couldn't be berthing
we couldn't be berthing
you couldn't be berthing
they couldn't be berthing	I couldn't have berthed
you couldn't have berthed
she couldn't have berthed
we couldn't have berthed
you couldn't have berthed
they couldn't have berthed	I couldn't have been berthing
you couldn't have been berthing
she couldn't have been berthing
we couldn't have been berthing
you couldn't have been berthing
they couldn't have been berthing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I berth?
could you berth?
could she berth?
could we berth?
could you berth?
could they berth? 	could I be berthing?
could you be berthing?
could she be berthing?
could we be berthing?
could you be berthing?
could they be berthing? 	could I have berthed?
could you have berthed?
could she have berthed?
could we have berthed?
could you have berthed?
could they have berthed? 	could I have been berthing?
could you have been berthing?
could she have been berthing?
could we have been berthing?
could you have been berthing?
could they have been berthing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I berth?
couldn't you berth?
couldn't she berth?
couldn't we berth?
couldn't you berth?
couldn't they berth? 	couldn't I be berthing?
couldn't you be berthing?
couldn't she be berthing?
couldn't we be berthing?
couldn't you be berthing?
couldn't they be berthing? 	couldn't I have berthed?
couldn't you have berthed?
couldn't she have berthed?
couldn't we have berthed?
couldn't you have berthed?
couldn't they have berthed? 	couldn't I have been berthing?
couldn't you have been berthing?
couldn't she have been berthing?
couldn't we have been berthing?
couldn't you have been berthing?
couldn't they have been berthing?