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 cannot concern
you cannot concern
he cannot concern
we cannot concern
you cannot concern
they cannot concern

V-ing form

I cannot be concerning
you cannot be concerning
he cannot be concerning
we cannot be concerning
you cannot be concerning
they cannot be concerning

Perfect

I cannot have concerned
you cannot have concerned
he cannot have concerned
we cannot have concerned
you cannot have concerned
they cannot have concerned

V-ing perfect

I cannot have been concerning
you cannot have been concerning
he cannot have been concerning
we cannot have been concerning
you cannot have been concerning
they cannot 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 I not concern?
can you not concern?
can he not concern?
can we not concern?
can you not concern?
can they not concern?

V-ing form

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

Perfect

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

V-ing perfect

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

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