一、be good to
1、It would be good to have a pencil and paper handy
2、Once I've reached those areas of concern, I should be good to go.
3、Why can't she be good to her sister?
二、be good for
1、Oh great! That'll be good for Fergus.
2、Rain water was once considered to be good for the complexion
3、In fact, they might be good for the economy.