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 couldn't concern
you couldn't concern
he couldn't concern
we couldn't concern
you couldn't concern
they couldn't concern

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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