English verb conjugation COULD CONCERN

Regular verb: concern - concerned - concerned

Affirmation

Simple form

I could concern
you could concern
he could concern
we could concern
you could concern
they could concern

V-ing form

I could be concerning
you could be concerning
he could be concerning
we could be concerning
you could be concerning
they could be concerning

Perfect

I could have concerned
you could have concerned
he could have concerned
we could have concerned
you could have concerned
they could have concerned

V-ing perfect

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

Negation

Simple form

I could not concern
you could not concern
he could not concern
we could not concern
you could not concern
they could not concern

V-ing form

I could not be concerning
you could not be concerning
he could not be concerning
we could not be concerning
you could not be concerning
they could not be concerning

Perfect

I could not have concerned
you could not have concerned
he could not have concerned
we could not have concerned
you could not have concerned
they could not have concerned

V-ing perfect

I could not have been concerning
you could not have been concerning
he could not have been concerning
we could not have been concerning
you could not have been concerning
they could not have been concerning

Interrogative form

Simple form

could I concern?
could you concern?
could he concern?
could we concern?
could you concern?
could they concern?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

could I not concern?
could you not concern?
could he not concern?
could we not concern?
could you not concern?
could they not concern?

V-ing form

could I not be concerning?
could you not be concerning?
could he not be concerning?
could we not be concerning?
could you not be concerning?
could they not be concerning?

Perfect

could I not have concerned?
could you not have concerned?
could he not have concerned?
could we not have concerned?
could you not have concerned?
could they not have concerned?

V-ing perfect

could I not have been concerning?
could you not have been concerning?
could he not have been concerning?
could we not have been concerning?
could you not have been concerning?
could they not have been concerning?

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