English verb conjugation
COULD PIGMENT

Regular verb: pigment - pigmented - pigmented

Affirmation

Simple form	V-ing form
I could pigment you could pigment he could pigment we could pigment you could pigment they could pigment	I could be pigmenting you could be pigmenting he could be pigmenting we could be pigmenting you could be pigmenting they could be pigmenting
Perfect	V-ing perfect
I could have pigmented you could have pigmented he could have pigmented we could have pigmented you could have pigmented they could have pigmented	I could have been pigmenting you could have been pigmenting he could have been pigmenting we could have been pigmenting you could have been pigmenting they could have been pigmenting

Negation

Simple form	V-ing form
I couldn't pigment you couldn't pigment he couldn't pigment we couldn't pigment you couldn't pigment they couldn't pigment	I couldn't be pigmenting you couldn't be pigmenting he couldn't be pigmenting we couldn't be pigmenting you couldn't be pigmenting they couldn't be pigmenting
Perfect	V-ing perfect
I couldn't have pigmented you couldn't have pigmented he couldn't have pigmented we couldn't have pigmented you couldn't have pigmented they couldn't have pigmented	I couldn't have been pigmenting you couldn't have been pigmenting he couldn't have been pigmenting we couldn't have been pigmenting you couldn't have been pigmenting they couldn't have been pigmenting

Interrogative form

Simple form	V-ing form
could I pigment? could you pigment? could he pigment? could we pigment? could you pigment? could they pigment?	could I be pigmenting? could you be pigmenting? could he be pigmenting? could we be pigmenting? could you be pigmenting? could they be pigmenting?
Perfect	V-ing perfect
could I have pigmented? could you have pigmented? could he have pigmented? could we have pigmented? could you have pigmented? could they have pigmented?	could I have been pigmenting? could you have been pigmenting? could he have been pigmenting? could we have been pigmenting? could you have been pigmenting? could they have been pigmenting?

Interro-negative form

Simple form	V-ing form
couldn't I pigment? couldn't you pigment? couldn't he pigment? couldn't we pigment? couldn't you pigment? couldn't they pigment?	couldn't I be pigmenting? couldn't you be pigmenting? couldn't he be pigmenting? couldn't we be pigmenting? couldn't you be pigmenting? couldn't they be pigmenting?
Perfect	V-ing perfect
couldn't I have pigmented? couldn't you have pigmented? couldn't he have pigmented? couldn't we have pigmented? couldn't you have pigmented? couldn't they have pigmented?	couldn't I have been pigmenting? couldn't you have been pigmenting? couldn't he have been pigmenting? couldn't we have been pigmenting? couldn't you have been pigmenting? couldn't they have been pigmenting?