be good with表示“和…相处的好”，相当于 get on well with.
be good to表示“对…好，对…和善 ”等。
It would be a good idea to call before we leave.
我们出发之前打个电话是个好主意。
Our results should be a good approximation to the true state of affairs.
我们的结果应该和实际情况相当接近。
Now let\'s all be good friends with ikuko, ok?
我们跟郁子成好朋友好不好？
