English verb conjugation
COULD WATERMARK

Regular verb: watermark - watermarked - watermarked

Affirmation

Simple form	V-ing form
I could watermark you could watermark she could watermark we could watermark you could watermark they could watermark	I could be watermarking you could be watermarking she could be watermarking we could be watermarking you could be watermarking they could be watermarking
Perfect	V-ing perfect
I could have watermarked you could have watermarked she could have watermarked we could have watermarked you could have watermarked they could have watermarked	I could have been watermarking you could have been watermarking she could have been watermarking we could have been watermarking you could have been watermarking they could have been watermarking

Negation

Simple form	V-ing form
I couldn't watermark you couldn't watermark she couldn't watermark we couldn't watermark you couldn't watermark they couldn't watermark	I couldn't be watermarking you couldn't be watermarking she couldn't be watermarking we couldn't be watermarking you couldn't be watermarking they couldn't be watermarking
Perfect	V-ing perfect
I couldn't have watermarked you couldn't have watermarked she couldn't have watermarked we couldn't have watermarked you couldn't have watermarked they couldn't have watermarked	I couldn't have been watermarking you couldn't have been watermarking she couldn't have been watermarking we couldn't have been watermarking you couldn't have been watermarking they couldn't have been watermarking

Interrogative form

Simple form	V-ing form
could I watermark? could you watermark? could she watermark? could we watermark? could you watermark? could they watermark?	could I be watermarking? could you be watermarking? could she be watermarking? could we be watermarking? could you be watermarking? could they be watermarking?
Perfect	V-ing perfect
could I have watermarked? could you have watermarked? could she have watermarked? could we have watermarked? could you have watermarked? could they have watermarked?	could I have been watermarking? could you have been watermarking? could she have been watermarking? could we have been watermarking? could you have been watermarking? could they have been watermarking?

Interro-negative form

Simple form	V-ing form
couldn't I watermark? couldn't you watermark? couldn't she watermark? couldn't we watermark? couldn't you watermark? couldn't they watermark?	couldn't I be watermarking? couldn't you be watermarking? couldn't she be watermarking? couldn't we be watermarking? couldn't you be watermarking? couldn't they be watermarking?
Perfect	V-ing perfect
couldn't I have watermarked? couldn't you have watermarked? couldn't she have watermarked? couldn't we have watermarked? couldn't you have watermarked? couldn't they have watermarked?	couldn't I have been watermarking? couldn't you have been watermarking? couldn't she have been watermarking? couldn't we have been watermarking? couldn't you have been watermarking? couldn't they have been watermarking?