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 couldn't milk you couldn't milk he couldn't milk we couldn't milk you couldn't milk they couldn't milk	I couldn't be milking you couldn't be milking he couldn't be milking we couldn't be milking you couldn't be milking they couldn't be milking
Perfect	V-ing perfect
I couldn't have milked you couldn't have milked he couldn't have milked we couldn't have milked you couldn't have milked they couldn't have milked	I couldn't have been milking you couldn't have been milking he couldn't have been milking we couldn't have been milking you couldn't have been milking they couldn't 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
couldn't I milk? couldn't you milk? couldn't he milk? couldn't we milk? couldn't you milk? couldn't they milk?	couldn't I be milking? couldn't you be milking? couldn't he be milking? couldn't we be milking? couldn't you be milking? couldn't they be milking?
Perfect	V-ing perfect
couldn't I have milked? couldn't you have milked? couldn't he have milked? couldn't we have milked? couldn't you have milked? couldn't they have milked?	couldn't I have been milking? couldn't you have been milking? couldn't he have been milking? couldn't we have been milking? couldn't you have been milking? couldn't they have been milking?