English verb conjugation
COULD SILK

Regular verb: silk - silked - silked

Affirmation

Simple form	V-ing form
I could silk you could silk he could silk we could silk you could silk they could silk	I could be silking you could be silking he could be silking we could be silking you could be silking they could be silking
Perfect	V-ing perfect
I could have silked you could have silked he could have silked we could have silked you could have silked they could have silked	I could have been silking you could have been silking he could have been silking we could have been silking you could have been silking they could have been silking

Negation

Simple form	V-ing form
I couldn't silk you couldn't silk he couldn't silk we couldn't silk you couldn't silk they couldn't silk	I couldn't be silking you couldn't be silking he couldn't be silking we couldn't be silking you couldn't be silking they couldn't be silking
Perfect	V-ing perfect
I couldn't have silked you couldn't have silked he couldn't have silked we couldn't have silked you couldn't have silked they couldn't have silked	I couldn't have been silking you couldn't have been silking he couldn't have been silking we couldn't have been silking you couldn't have been silking they couldn't have been silking

Interrogative form

Simple form	V-ing form
could I silk? could you silk? could he silk? could we silk? could you silk? could they silk?	could I be silking? could you be silking? could he be silking? could we be silking? could you be silking? could they be silking?
Perfect	V-ing perfect
could I have silked? could you have silked? could he have silked? could we have silked? could you have silked? could they have silked?	could I have been silking? could you have been silking? could he have been silking? could we have been silking? could you have been silking? could they have been silking?

Interro-negative form

Simple form	V-ing form
couldn't I silk? couldn't you silk? couldn't he silk? couldn't we silk? couldn't you silk? couldn't they silk?	couldn't I be silking? couldn't you be silking? couldn't he be silking? couldn't we be silking? couldn't you be silking? couldn't they be silking?
Perfect	V-ing perfect
couldn't I have silked? couldn't you have silked? couldn't he have silked? couldn't we have silked? couldn't you have silked? couldn't they have silked?	couldn't I have been silking? couldn't you have been silking? couldn't he have been silking? couldn't we have been silking? couldn't you have been silking? couldn't they have been silking?