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