English verb conjugation
COULD BILK

Regular verb: bilk - bilked - bilked

Affirmation

Simple form	V-ing form
I could bilk you could bilk he could bilk we could bilk you could bilk they could bilk	I could be bilking you could be bilking he could be bilking we could be bilking you could be bilking they could be bilking
Perfect	V-ing perfect
I could have bilked you could have bilked he could have bilked we could have bilked you could have bilked they could have bilked	I could have been bilking you could have been bilking he could have been bilking we could have been bilking you could have been bilking they could have been bilking

Negation

Simple form	V-ing form
I couldn't bilk you couldn't bilk he couldn't bilk we couldn't bilk you couldn't bilk they couldn't bilk	I couldn't be bilking you couldn't be bilking he couldn't be bilking we couldn't be bilking you couldn't be bilking they couldn't be bilking
Perfect	V-ing perfect
I couldn't have bilked you couldn't have bilked he couldn't have bilked we couldn't have bilked you couldn't have bilked they couldn't have bilked	I couldn't have been bilking you couldn't have been bilking he couldn't have been bilking we couldn't have been bilking you couldn't have been bilking they couldn't have been bilking

Interrogative form

Simple form	V-ing form
could I bilk? could you bilk? could he bilk? could we bilk? could you bilk? could they bilk?	could I be bilking? could you be bilking? could he be bilking? could we be bilking? could you be bilking? could they be bilking?
Perfect	V-ing perfect
could I have bilked? could you have bilked? could he have bilked? could we have bilked? could you have bilked? could they have bilked?	could I have been bilking? could you have been bilking? could he have been bilking? could we have been bilking? could you have been bilking? could they have been bilking?

Interro-negative form

Simple form	V-ing form
couldn't I bilk? couldn't you bilk? couldn't he bilk? couldn't we bilk? couldn't you bilk? couldn't they bilk?	couldn't I be bilking? couldn't you be bilking? couldn't he be bilking? couldn't we be bilking? couldn't you be bilking? couldn't they be bilking?
Perfect	V-ing perfect
couldn't I have bilked? couldn't you have bilked? couldn't he have bilked? couldn't we have bilked? couldn't you have bilked? couldn't they have bilked?	couldn't I have been bilking? couldn't you have been bilking? couldn't he have been bilking? couldn't we have been bilking? couldn't you have been bilking? couldn't they have been bilking?