be good with意為“靈巧的；與……相處得好”.
例如：
She is good with her hands.她手很巧.
He is very good with the children.他與這些孩子處得很好.
be good to意為“對……友好”.
例如：
My friend was good to me when I was ill.我生病時(shí)我的朋友對我關(guān)懷備至.