English verb conjugation
COULD NICKNAME

Regular verb: nickname - nicknamed - nicknamed

Affirmation

Simple form	V-ing form
I could nickname you could nickname he could nickname we could nickname you could nickname they could nickname	I could be nicknaming you could be nicknaming he could be nicknaming we could be nicknaming you could be nicknaming they could be nicknaming
Perfect	V-ing perfect
I could have nicknamed you could have nicknamed he could have nicknamed we could have nicknamed you could have nicknamed they could have nicknamed	I could have been nicknaming you could have been nicknaming he could have been nicknaming we could have been nicknaming you could have been nicknaming they could have been nicknaming

Negation

Simple form	V-ing form
I couldn't nickname you couldn't nickname he couldn't nickname we couldn't nickname you couldn't nickname they couldn't nickname	I couldn't be nicknaming you couldn't be nicknaming he couldn't be nicknaming we couldn't be nicknaming you couldn't be nicknaming they couldn't be nicknaming
Perfect	V-ing perfect
I couldn't have nicknamed you couldn't have nicknamed he couldn't have nicknamed we couldn't have nicknamed you couldn't have nicknamed they couldn't have nicknamed	I couldn't have been nicknaming you couldn't have been nicknaming he couldn't have been nicknaming we couldn't have been nicknaming you couldn't have been nicknaming they couldn't have been nicknaming

Interrogative form

Simple form	V-ing form
could I nickname? could you nickname? could he nickname? could we nickname? could you nickname? could they nickname?	could I be nicknaming? could you be nicknaming? could he be nicknaming? could we be nicknaming? could you be nicknaming? could they be nicknaming?
Perfect	V-ing perfect
could I have nicknamed? could you have nicknamed? could he have nicknamed? could we have nicknamed? could you have nicknamed? could they have nicknamed?	could I have been nicknaming? could you have been nicknaming? could he have been nicknaming? could we have been nicknaming? could you have been nicknaming? could they have been nicknaming?

Interro-negative form

Simple form	V-ing form
couldn't I nickname? couldn't you nickname? couldn't he nickname? couldn't we nickname? couldn't you nickname? couldn't they nickname?	couldn't I be nicknaming? couldn't you be nicknaming? couldn't he be nicknaming? couldn't we be nicknaming? couldn't you be nicknaming? couldn't they be nicknaming?
Perfect	V-ing perfect
couldn't I have nicknamed? couldn't you have nicknamed? couldn't he have nicknamed? couldn't we have nicknamed? couldn't you have nicknamed? couldn't they have nicknamed?	couldn't I have been nicknaming? couldn't you have been nicknaming? couldn't he have been nicknaming? couldn't we have been nicknaming? couldn't you have been nicknaming? couldn't they have been nicknaming?