You
You are good at skiing.
We not
We aren't good at swimming.
She
She is good at painting.
We not
We aren't good at dancing.
It
It is good at cooking.
It not
It isn't good at writing.
You not
You aren't good at running.
They
They are good at driving.
She not
She isn't good at singing.
I
I am good at fishing.
He not
He isn't good at flying.
She
She is good at skating.