English verb conjugation COULD AUTHENTICATE

Regular verb: authenticate - authenticated - authenticated

Affirmation

Simple form

I could authenticate
you could authenticate
he could authenticate
we could authenticate
you could authenticate
they could authenticate

V-ing form

I could be authenticating
you could be authenticating
he could be authenticating
we could be authenticating
you could be authenticating
they could be authenticating

Perfect

I could have authenticated
you could have authenticated
he could have authenticated
we could have authenticated
you could have authenticated
they could have authenticated

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I authenticate?
could you authenticate?
could he authenticate?
could we authenticate?
could you authenticate?
could they authenticate?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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