She has a good friend 改成否定句

she doesn't have a good friend

you r fool.

She has no friends.

she haven't a good friend.

两个答案都可以：
She doesn't have (any) good friend(s).
She has no good friends.
()表示可加可不加
对了，还有一个She haven't got (any) good friend(s).不过这个很少用~~

1：She doesn't have a good friend
2：She has not a good friend都可以的,只是原则鼓励小朋友用第一种,清晰明了,不易搞混