English verb conjugation COULD CERTIFY

Regular verb: certify - certified - certified

Affirmation

Simple form

I could certify
you could certify
he could certify
we could certify
you could certify
they could certify

V-ing form

I could be certifying
you could be certifying
he could be certifying
we could be certifying
you could be certifying
they could be certifying

Perfect

I could have certified
you could have certified
he could have certified
we could have certified
you could have certified
they could have certified

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I certify?
could you certify?
could he certify?
could we certify?
could you certify?
could they certify?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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