English verb conjugation CAN CERTIFY

Regular verb: certify - certified - certified

Affirmation

Simple form

I can certify
you can certify
he can certify
we can certify
you can certify
they can certify

V-ing form

I can be certifying
you can be certifying
he can be certifying
we can be certifying
you can be certifying
they can be certifying

Perfect

I can have certified
you can have certified
he 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
he 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
he 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
he 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
he 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
he 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 he certify?
can we certify?
can you certify?
can they certify?

V-ing form

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

Perfect

can I have certified?
can you have certified?
can he 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 he 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 he 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 he 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 he 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 he 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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