English verb conjugation COULD POSTMARK

Regular verb: postmark - postmarked - postmarked

Affirmation

Simple form

I could postmark
you could postmark
he could postmark
we could postmark
you could postmark
they could postmark

V-ing form

I could be postmarking
you could be postmarking
he could be postmarking
we could be postmarking
you could be postmarking
they could be postmarking

Perfect

I could have postmarked
you could have postmarked
he could have postmarked
we could have postmarked
you could have postmarked
they could have postmarked

V-ing perfect

I could have been postmarking
you could have been postmarking
he could have been postmarking
we could have been postmarking
you could have been postmarking
they could have been postmarking

Negation

Simple form

I couldn't postmark
you couldn't postmark
he couldn't postmark
we couldn't postmark
you couldn't postmark
they couldn't postmark

V-ing form

I couldn't be postmarking
you couldn't be postmarking
he couldn't be postmarking
we couldn't be postmarking
you couldn't be postmarking
they couldn't be postmarking

Perfect

I couldn't have postmarked
you couldn't have postmarked
he couldn't have postmarked
we couldn't have postmarked
you couldn't have postmarked
they couldn't have postmarked

V-ing perfect

I couldn't have been postmarking
you couldn't have been postmarking
he couldn't have been postmarking
we couldn't have been postmarking
you couldn't have been postmarking
they couldn't have been postmarking

Interrogative form

Simple form

could I postmark?
could you postmark?
could he postmark?
could we postmark?
could you postmark?
could they postmark?

V-ing form

could I be postmarking?
could you be postmarking?
could he be postmarking?
could we be postmarking?
could you be postmarking?
could they be postmarking?

Perfect

could I have postmarked?
could you have postmarked?
could he have postmarked?
could we have postmarked?
could you have postmarked?
could they have postmarked?

V-ing perfect

could I have been postmarking?
could you have been postmarking?
could he have been postmarking?
could we have been postmarking?
could you have been postmarking?
could they have been postmarking?

Interro-negative form

Simple form

couldn't I postmark?
couldn't you postmark?
couldn't he postmark?
couldn't we postmark?
couldn't you postmark?
couldn't they postmark?

V-ing form

couldn't I be postmarking?
couldn't you be postmarking?
couldn't he be postmarking?
couldn't we be postmarking?
couldn't you be postmarking?
couldn't they be postmarking?

Perfect

couldn't I have postmarked?
couldn't you have postmarked?
couldn't he have postmarked?
couldn't we have postmarked?
couldn't you have postmarked?
couldn't they have postmarked?

V-ing perfect

couldn't I have been postmarking?
couldn't you have been postmarking?
couldn't he have been postmarking?
couldn't we have been postmarking?
couldn't you have been postmarking?
couldn't they have been postmarking?

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