English verb conjugation
COULD JAB

Regular verb: jab - jabbed - jabbed

Affirmation

Simple form	V-ing form
I could jab you could jab he could jab we could jab you could jab they could jab	I could be jabbing you could be jabbing he could be jabbing we could be jabbing you could be jabbing they could be jabbing
Perfect	V-ing perfect
I could have jabbed you could have jabbed he could have jabbed we could have jabbed you could have jabbed they could have jabbed	I could have been jabbing you could have been jabbing he could have been jabbing we could have been jabbing you could have been jabbing they could have been jabbing

Negation

Simple form	V-ing form
I couldn't jab you couldn't jab he couldn't jab we couldn't jab you couldn't jab they couldn't jab	I couldn't be jabbing you couldn't be jabbing he couldn't be jabbing we couldn't be jabbing you couldn't be jabbing they couldn't be jabbing
Perfect	V-ing perfect
I couldn't have jabbed you couldn't have jabbed he couldn't have jabbed we couldn't have jabbed you couldn't have jabbed they couldn't have jabbed	I couldn't have been jabbing you couldn't have been jabbing he couldn't have been jabbing we couldn't have been jabbing you couldn't have been jabbing they couldn't have been jabbing

Interrogative form

Simple form	V-ing form
could I jab? could you jab? could he jab? could we jab? could you jab? could they jab?	could I be jabbing? could you be jabbing? could he be jabbing? could we be jabbing? could you be jabbing? could they be jabbing?
Perfect	V-ing perfect
could I have jabbed? could you have jabbed? could he have jabbed? could we have jabbed? could you have jabbed? could they have jabbed?	could I have been jabbing? could you have been jabbing? could he have been jabbing? could we have been jabbing? could you have been jabbing? could they have been jabbing?

Interro-negative form

Simple form	V-ing form
couldn't I jab? couldn't you jab? couldn't he jab? couldn't we jab? couldn't you jab? couldn't they jab?	couldn't I be jabbing? couldn't you be jabbing? couldn't he be jabbing? couldn't we be jabbing? couldn't you be jabbing? couldn't they be jabbing?
Perfect	V-ing perfect
couldn't I have jabbed? couldn't you have jabbed? couldn't he have jabbed? couldn't we have jabbed? couldn't you have jabbed? couldn't they have jabbed?	couldn't I have been jabbing? couldn't you have been jabbing? couldn't he have been jabbing? couldn't we have been jabbing? couldn't you have been jabbing? couldn't they have been jabbing?