English verb conjugation
COULD MILK

Regular verb: milk - milked - milked

Affirmation

Simple form	V-ing form
I could milk you could milk he could milk we could milk you could milk they could milk	I could be milking you could be milking he could be milking we could be milking you could be milking they could be milking
Perfect	V-ing perfect
I could have milked you could have milked he could have milked we could have milked you could have milked they could have milked	I could have been milking you could have been milking he could have been milking we could have been milking you could have been milking they could have been milking

Negation

Simple form	V-ing form
I could not milk you could not milk he could not milk we could not milk you could not milk they could not milk	I could not be milking you could not be milking he could not be milking we could not be milking you could not be milking they could not be milking
Perfect	V-ing perfect
I could not have milked you could not have milked he could not have milked we could not have milked you could not have milked they could not have milked	I could not have been milking you could not have been milking he could not have been milking we could not have been milking you could not have been milking they could not have been milking

Interrogative form

Simple form	V-ing form
could I milk? could you milk? could he milk? could we milk? could you milk? could they milk?	could I be milking? could you be milking? could he be milking? could we be milking? could you be milking? could they be milking?
Perfect	V-ing perfect
could I have milked? could you have milked? could he have milked? could we have milked? could you have milked? could they have milked?	could I have been milking? could you have been milking? could he have been milking? could we have been milking? could you have been milking? could they have been milking?

Interro-negative form

Simple form	V-ing form
could I not milk? could you not milk? could he not milk? could we not milk? could you not milk? could they not milk?	could I not be milking? could you not be milking? could he not be milking? could we not be milking? could you not be milking? could they not be milking?
Perfect	V-ing perfect
could I not have milked? could you not have milked? could he not have milked? could we not have milked? could you not have milked? could they not have milked?	could I not have been milking? could you not have been milking? could he not have been milking? could we not have been milking? could you not have been milking? could they not have been milking?