be good with 指“善于……”可加sb.指善与某人相处.eg.He is good with children.他善于和孩子相处.还可加sth.指“善于使用某物”.He is good with the tool.他善于使用这种工具.
be good to 指“对……友好,友善”Our teacher is good to us.我们老师对我们很友好.