could watermark
Regular verb: watermark - watermarked- watermarked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I could not watermark
you could not watermark
she could not watermark
we could not watermark
you could not watermark
they could not watermark 	I could not be watermarking
you could not be watermarking
she could not be watermarking
we could not be watermarking
you could not be watermarking
they could not be watermarking	I could not have watermarked
you could not have watermarked
she could not have watermarked
we could not have watermarked
you could not have watermarked
they could not have watermarked	I could not have been watermarking
you could not have been watermarking
she could not have been watermarking
we could not have been watermarking
you could not have been watermarking
they could not have been watermarking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
could I not watermark?
could you not watermark?
could she not watermark?
could we not watermark?
could you not watermark?
could they not watermark? 	could I not be watermarking?
could you not be watermarking?
could she not be watermarking?
could we not be watermarking?
could you not be watermarking?
could they not be watermarking? 	could I not have watermarked?
could you not have watermarked?
could she not have watermarked?
could we not have watermarked?
could you not have watermarked?
could they not have watermarked? 	could I not have been watermarking?
could you not have been watermarking?
could she not have been watermarking?
could we not have been watermarking?
could you not have been watermarking?
could they not have been watermarking?