English verb conjugation CAN CERTIFY

Regular verb: certify - certified - certified

Affirmation

Simple form

I can certify
you can certify
she can certify
we can certify
you can certify
they can certify

V-ing form

I can be certifying
you can be certifying
she can be certifying
we can be certifying
you can be certifying
they can be certifying

Perfect

I can have certified
you can have certified
she can have certified
we can have certified
you can have certified
they can have certified

V-ing perfect

I can have been certifying
you can have been certifying
she can have been certifying
we can have been certifying
you can have been certifying
they can have been certifying

Negation

Simple form

I can't certify
you can't certify
she can't certify
we can't certify
you can't certify
they can't certify

V-ing form

I can't be certifying
you can't be certifying
she can't be certifying
we can't be certifying
you can't be certifying
they can't be certifying

Perfect

I can't have certified
you can't have certified
she can't have certified
we can't have certified
you can't have certified
they can't have certified

V-ing perfect

I can't have been certifying
you can't have been certifying
she can't have been certifying
we can't have been certifying
you can't have been certifying
they can't have been certifying

Interrogative form

Simple form

can I certify?
can you certify?
can she certify?
can we certify?
can you certify?
can they certify?

V-ing form

can I be certifying?
can you be certifying?
can she be certifying?
can we be certifying?
can you be certifying?
can they be certifying?

Perfect

can I have certified?
can you have certified?
can she have certified?
can we have certified?
can you have certified?
can they have certified?

V-ing perfect

can I have been certifying?
can you have been certifying?
can she have been certifying?
can we have been certifying?
can you have been certifying?
can they have been certifying?

Interro-negative form

Simple form

can't I certify?
can't you certify?
can't she certify?
can't we certify?
can't you certify?
can't they certify?

V-ing form

can't I be certifying?
can't you be certifying?
can't she be certifying?
can't we be certifying?
can't you be certifying?
can't they be certifying?

Perfect

can't I have certified?
can't you have certified?
can't she have certified?
can't we have certified?
can't you have certified?
can't they have certified?

V-ing perfect

can't I have been certifying?
can't you have been certifying?
can't she have been certifying?
can't we have been certifying?
can't you have been certifying?
can't they have been certifying?

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