English verb conjugation
COULD MILK

Regular verb: milk - milked - milked

Affirmation

Simple form	V-ing form
I could milk you could milk she could milk we could milk you could milk they could milk	I could be milking you could be milking she 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 she 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 she 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 she 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 she 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 she 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 she 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 she milk? could we milk? could you milk? could they milk?	could I be milking? could you be milking? could she 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 she 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 she 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 she 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 she 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 she 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 she have been milking? couldn't we have been milking? couldn't you have been milking? couldn't they have been milking?