English verb conjugation COULD CERTIFICATE

Regular verb: certificate - certificated - certificated

Affirmation

Simple form

I could certificate
you could certificate
he could certificate
we could certificate
you could certificate
they could certificate

V-ing form

I could be certificating
you could be certificating
he could be certificating
we could be certificating
you could be certificating
they could be certificating

Perfect

I could have certificated
you could have certificated
he could have certificated
we could have certificated
you could have certificated
they could have certificated

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I certificate?
could you certificate?
could he certificate?
could we certificate?
could you certificate?
could they certificate?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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