English verb conjugation
COULD COMB

Regular verb: comb - combed - combed

Affirmation

Simple form	V-ing form
I could comb you could comb he could comb we could comb you could comb they could comb	I could be combing you could be combing he could be combing we could be combing you could be combing they could be combing
Perfect	V-ing perfect
I could have combed you could have combed he could have combed we could have combed you could have combed they could have combed	I could have been combing you could have been combing he could have been combing we could have been combing you could have been combing they could have been combing

Negation

Simple form	V-ing form
I couldn't comb you couldn't comb he couldn't comb we couldn't comb you couldn't comb they couldn't comb	I couldn't be combing you couldn't be combing he couldn't be combing we couldn't be combing you couldn't be combing they couldn't be combing
Perfect	V-ing perfect
I couldn't have combed you couldn't have combed he couldn't have combed we couldn't have combed you couldn't have combed they couldn't have combed	I couldn't have been combing you couldn't have been combing he couldn't have been combing we couldn't have been combing you couldn't have been combing they couldn't have been combing

Interrogative form

Simple form	V-ing form
could I comb? could you comb? could he comb? could we comb? could you comb? could they comb?	could I be combing? could you be combing? could he be combing? could we be combing? could you be combing? could they be combing?
Perfect	V-ing perfect
could I have combed? could you have combed? could he have combed? could we have combed? could you have combed? could they have combed?	could I have been combing? could you have been combing? could he have been combing? could we have been combing? could you have been combing? could they have been combing?

Interro-negative form

Simple form	V-ing form
couldn't I comb? couldn't you comb? couldn't he comb? couldn't we comb? couldn't you comb? couldn't they comb?	couldn't I be combing? couldn't you be combing? couldn't he be combing? couldn't we be combing? couldn't you be combing? couldn't they be combing?
Perfect	V-ing perfect
couldn't I have combed? couldn't you have combed? couldn't he have combed? couldn't we have combed? couldn't you have combed? couldn't they have combed?	couldn't I have been combing? couldn't you have been combing? couldn't he have been combing? couldn't we have been combing? couldn't you have been combing? couldn't they have been combing?