English verb conjugation
COULD ROB

Regular verb: rob - robbed - robbed

Affirmation

Simple form	V-ing form
I could rob you could rob he could rob we could rob you could rob they could rob	I could be robbing you could be robbing he could be robbing we could be robbing you could be robbing they could be robbing
Perfect	V-ing perfect
I could have robbed you could have robbed he could have robbed we could have robbed you could have robbed they could have robbed	I could have been robbing you could have been robbing he could have been robbing we could have been robbing you could have been robbing they could have been robbing

Negation

Simple form	V-ing form
I couldn't rob you couldn't rob he couldn't rob we couldn't rob you couldn't rob they couldn't rob	I couldn't be robbing you couldn't be robbing he couldn't be robbing we couldn't be robbing you couldn't be robbing they couldn't be robbing
Perfect	V-ing perfect
I couldn't have robbed you couldn't have robbed he couldn't have robbed we couldn't have robbed you couldn't have robbed they couldn't have robbed	I couldn't have been robbing you couldn't have been robbing he couldn't have been robbing we couldn't have been robbing you couldn't have been robbing they couldn't have been robbing

Interrogative form

Simple form	V-ing form
could I rob? could you rob? could he rob? could we rob? could you rob? could they rob?	could I be robbing? could you be robbing? could he be robbing? could we be robbing? could you be robbing? could they be robbing?
Perfect	V-ing perfect
could I have robbed? could you have robbed? could he have robbed? could we have robbed? could you have robbed? could they have robbed?	could I have been robbing? could you have been robbing? could he have been robbing? could we have been robbing? could you have been robbing? could they have been robbing?

Interro-negative form

Simple form	V-ing form
couldn't I rob? couldn't you rob? couldn't he rob? couldn't we rob? couldn't you rob? couldn't they rob?	couldn't I be robbing? couldn't you be robbing? couldn't he be robbing? couldn't we be robbing? couldn't you be robbing? couldn't they be robbing?
Perfect	V-ing perfect
couldn't I have robbed? couldn't you have robbed? couldn't he have robbed? couldn't we have robbed? couldn't you have robbed? couldn't they have robbed?	couldn't I have been robbing? couldn't you have been robbing? couldn't he have been robbing? couldn't we have been robbing? couldn't you have been robbing? couldn't they have been robbing?