English verb conjugation
COULD BERTH

Regular verb: berth - berthed - berthed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not berth you could not berth she could not berth we could not berth you could not berth they could not berth	I could not be berthing you could not be berthing she could not be berthing we could not be berthing you could not be berthing they could not be berthing
Perfect	V-ing perfect
I could not have berthed you could not have berthed she could not have berthed we could not have berthed you could not have berthed they could not have berthed	I could not have been berthing you could not have been berthing she could not have been berthing we could not have been berthing you could not have been berthing they could not have been berthing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not berth? could you not berth? could she not berth? could we not berth? could you not berth? could they not berth?	could I not be berthing? could you not be berthing? could she not be berthing? could we not be berthing? could you not be berthing? could they not be berthing?
Perfect	V-ing perfect
could I not have berthed? could you not have berthed? could she not have berthed? could we not have berthed? could you not have berthed? could they not have berthed?	could I not have been berthing? could you not have been berthing? could she not have been berthing? could we not have been berthing? could you not have been berthing? could they not have been berthing?