好朋友的好用英语是 "a good friend is a good thing." 这是一个习惯用语，来源于英文谚语 "a good friend is a treasure."，意思是指好朋友很宝贵。

下面是一些英文例句及其中文翻译：

"Having a good friend is a blessing. They make pfe better and brighter."
"有一个好朋友是一种祝福。他们让生活变得更好、更明亮。"

"A good friend is someone who is always there for you, no matter what."
"好朋友就是无论发生什么都会为你出头的人。"

"Having a good friend by your side can make all the difference in the world."
"有一个好朋友在你身边可以让世界变得完全不同。"

希望这些例句能帮助你。