English verb conjugation COULD STAPLE

Regular verb: staple - stapled - stapled

Affirmation

Simple form

I could staple
you could staple
he could staple
we could staple
you could staple
they could staple

V-ing form

I could be stapling
you could be stapling
he could be stapling
we could be stapling
you could be stapling
they could be stapling

Perfect

I could have stapled
you could have stapled
he could have stapled
we could have stapled
you could have stapled
they could have stapled

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I staple?
could you staple?
could he staple?
could we staple?
could you staple?
could they staple?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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