good samaritan 好撒玛利亚人,行善的人
例：John was a good samaritan today. He helped an old man cross a busy road.
good as gold 一诺千金
例： John‘s word is as good as gold. If he says he'll do it, he WILL do it.
good as new 完好如新
例：I have repaired the bike. It is good as new.
so far so good 目前为止,一切都好
例：The work is very difficult, but so far so good.
have a good day （告辞时用的礼貌语）
例：Thank you. Have a good day.