English verb conjugation
COULD CHURN

Regular verb: churn - churned - churned

Affirmation

Simple form	V-ing form
I could churn you could churn he could churn we could churn you could churn they could churn	I could be churning you could be churning he could be churning we could be churning you could be churning they could be churning
Perfect	V-ing perfect
I could have churned you could have churned he could have churned we could have churned you could have churned they could have churned	I could have been churning you could have been churning he could have been churning we could have been churning you could have been churning they could have been churning

Negation

Simple form	V-ing form
I couldn't churn you couldn't churn he couldn't churn we couldn't churn you couldn't churn they couldn't churn	I couldn't be churning you couldn't be churning he couldn't be churning we couldn't be churning you couldn't be churning they couldn't be churning
Perfect	V-ing perfect
I couldn't have churned you couldn't have churned he couldn't have churned we couldn't have churned you couldn't have churned they couldn't have churned	I couldn't have been churning you couldn't have been churning he couldn't have been churning we couldn't have been churning you couldn't have been churning they couldn't have been churning

Interrogative form

Simple form	V-ing form
could I churn? could you churn? could he churn? could we churn? could you churn? could they churn?	could I be churning? could you be churning? could he be churning? could we be churning? could you be churning? could they be churning?
Perfect	V-ing perfect
could I have churned? could you have churned? could he have churned? could we have churned? could you have churned? could they have churned?	could I have been churning? could you have been churning? could he have been churning? could we have been churning? could you have been churning? could they have been churning?

Interro-negative form

Simple form	V-ing form
couldn't I churn? couldn't you churn? couldn't he churn? couldn't we churn? couldn't you churn? couldn't they churn?	couldn't I be churning? couldn't you be churning? couldn't he be churning? couldn't we be churning? couldn't you be churning? couldn't they be churning?
Perfect	V-ing perfect
couldn't I have churned? couldn't you have churned? couldn't he have churned? couldn't we have churned? couldn't you have churned? couldn't they have churned?	couldn't I have been churning? couldn't you have been churning? couldn't he have been churning? couldn't we have been churning? couldn't you have been churning? couldn't they have been churning?