English verb conjugation CAN CONCERN

Regular verb: concern - concerned - concerned

Affirmation

Simple form

I can concern
you can concern
he can concern
we can concern
you can concern
they can concern

V-ing form

I can be concerning
you can be concerning
he can be concerning
we can be concerning
you can be concerning
they can be concerning

Perfect

I can have concerned
you can have concerned
he can have concerned
we can have concerned
you can have concerned
they can have concerned

V-ing perfect

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

Negation

Simple form

I can't concern
you can't concern
he can't concern
we can't concern
you can't concern
they can't concern

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

can I concern?
can you concern?
can he concern?
can we concern?
can you concern?
can they concern?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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