could hallmark
Regular verb: hallmark - hallmarked- hallmarked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could hallmark
you could hallmark
she could hallmark
we could hallmark
you could hallmark
they could hallmark 	I could be hallmarking
you could be hallmarking
she could be hallmarking
we could be hallmarking
you could be hallmarking
they could be hallmarking	I could have hallmarked
you could have hallmarked
she could have hallmarked
we could have hallmarked
you could have hallmarked
they could have hallmarked	I could have been hallmarking
you could have been hallmarking
she could have been hallmarking
we could have been hallmarking
you could have been hallmarking
they could have been hallmarking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't hallmark
you couldn't hallmark
she couldn't hallmark
we couldn't hallmark
you couldn't hallmark
they couldn't hallmark 	I couldn't be hallmarking
you couldn't be hallmarking
she couldn't be hallmarking
we couldn't be hallmarking
you couldn't be hallmarking
they couldn't be hallmarking	I couldn't have hallmarked
you couldn't have hallmarked
she couldn't have hallmarked
we couldn't have hallmarked
you couldn't have hallmarked
they couldn't have hallmarked	I couldn't have been hallmarking
you couldn't have been hallmarking
she couldn't have been hallmarking
we couldn't have been hallmarking
you couldn't have been hallmarking
they couldn't have been hallmarking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I hallmark?
could you hallmark?
could she hallmark?
could we hallmark?
could you hallmark?
could they hallmark? 	could I be hallmarking?
could you be hallmarking?
could she be hallmarking?
could we be hallmarking?
could you be hallmarking?
could they be hallmarking? 	could I have hallmarked?
could you have hallmarked?
could she have hallmarked?
could we have hallmarked?
could you have hallmarked?
could they have hallmarked? 	could I have been hallmarking?
could you have been hallmarking?
could she have been hallmarking?
could we have been hallmarking?
could you have been hallmarking?
could they have been hallmarking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I hallmark?
couldn't you hallmark?
couldn't she hallmark?
couldn't we hallmark?
couldn't you hallmark?
couldn't they hallmark? 	couldn't I be hallmarking?
couldn't you be hallmarking?
couldn't she be hallmarking?
couldn't we be hallmarking?
couldn't you be hallmarking?
couldn't they be hallmarking? 	couldn't I have hallmarked?
couldn't you have hallmarked?
couldn't she have hallmarked?
couldn't we have hallmarked?
couldn't you have hallmarked?
couldn't they have hallmarked? 	couldn't I have been hallmarking?
couldn't you have been hallmarking?
couldn't she have been hallmarking?
couldn't we have been hallmarking?
couldn't you have been hallmarking?
couldn't they have been hallmarking?