present
I concern
You concern
He concerns
She concerns
It concerns
We concern
They concern
past
I concerned
You concerned
He concerned
She concerned
It concerned
We concerned
They concerned
future
I will concern
You will concern
He will concern
She will concern
It will concern
We will concern
They will concern
conditional
I would concern
You would concern
He would concern
She would concern
It would concern
We would concern
They would concern