English verb conjugation
CAN POSTMARK

Regular verb: postmark - postmarked - postmarked

Affirmation

Simple form	V-ing form
I can postmark you can postmark she can postmark we can postmark you can postmark they can postmark	I can be postmarking you can be postmarking she can be postmarking we can be postmarking you can be postmarking they can be postmarking
Perfect	V-ing perfect
I can have postmarked you can have postmarked she can have postmarked we can have postmarked you can have postmarked they can have postmarked	I can have been postmarking you can have been postmarking she can have been postmarking we can have been postmarking you can have been postmarking they can have been postmarking

Negation

Simple form	V-ing form
I can't postmark you can't postmark she can't postmark we can't postmark you can't postmark they can't postmark	I can't be postmarking you can't be postmarking she can't be postmarking we can't be postmarking you can't be postmarking they can't be postmarking
Perfect	V-ing perfect
I can't have postmarked you can't have postmarked she can't have postmarked we can't have postmarked you can't have postmarked they can't have postmarked	I can't have been postmarking you can't have been postmarking she can't have been postmarking we can't have been postmarking you can't have been postmarking they can't have been postmarking

Interrogative form

Simple form	V-ing form
can I postmark? can you postmark? can she postmark? can we postmark? can you postmark? can they postmark?	can I be postmarking? can you be postmarking? can she be postmarking? can we be postmarking? can you be postmarking? can they be postmarking?
Perfect	V-ing perfect
can I have postmarked? can you have postmarked? can she have postmarked? can we have postmarked? can you have postmarked? can they have postmarked?	can I have been postmarking? can you have been postmarking? can she have been postmarking? can we have been postmarking? can you have been postmarking? can they have been postmarking?

Interro-negative form

Simple form	V-ing form
can't I postmark? can't you postmark? can't she postmark? can't we postmark? can't you postmark? can't they postmark?	can't I be postmarking? can't you be postmarking? can't she be postmarking? can't we be postmarking? can't you be postmarking? can't they be postmarking?
Perfect	V-ing perfect
can't I have postmarked? can't you have postmarked? can't she have postmarked? can't we have postmarked? can't you have postmarked? can't they have postmarked?	can't I have been postmarking? can't you have been postmarking? can't she have been postmarking? can't we have been postmarking? can't you have been postmarking? can't they have been postmarking?