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 cannot certify
you cannot certify
he cannot certify
we cannot certify
you cannot certify
they cannot certify

V-ing form

I cannot be certifying
you cannot be certifying
he cannot be certifying
we cannot be certifying
you cannot be certifying
they cannot be certifying

Perfect

I cannot have certified
you cannot have certified
he cannot have certified
we cannot have certified
you cannot have certified
they cannot have certified

V-ing perfect

I cannot have been certifying
you cannot have been certifying
he cannot have been certifying
we cannot have been certifying
you cannot have been certifying
they cannot 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 I not certify?
can you not certify?
can he not certify?
can we not certify?
can you not certify?
can they not certify?

V-ing form

can I not be certifying?
can you not be certifying?
can he not be certifying?
can we not be certifying?
can you not be certifying?
can they not be certifying?

Perfect

can I not have certified?
can you not have certified?
can he not have certified?
can we not have certified?
can you not have certified?
can they not have certified?

V-ing perfect

can I not have been certifying?
can you not have been certifying?
can he not have been certifying?
can we not have been certifying?
can you not have been certifying?
can they not have been certifying?

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