English verb conjugation
COULD JAB

Regular verb: jab - jabbed - jabbed

Affirmation

Simple form	V-ing form
I could jab you could jab she could jab we could jab you could jab they could jab	I could be jabbing you could be jabbing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she jab? could we jab? could you jab? could they jab?	could I be jabbing? could you be jabbing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been jabbing? couldn't we have been jabbing? couldn't you have been jabbing? couldn't they have been jabbing?