坐牢相關表達：
good time
good conduct time
good time credit
means time deducted from an inmate's sentence for good behavior while in prison
表示監獄里面的犯人因為做了一些好的行為而被減刑

do time
在監獄服刑
I did time at the Changsha county jail for robbing the jewelry store.
我之前因為搶劫珠寶店在長沙縣監獄關了一陣子。

in the pen
在監獄里（此處pen為penitentiary的縮寫形式）
His wife ran away with another man while he was in the pen.
他在監獄的時候，他的老婆和另外一個男人跑了。

其他相關表達：
have a good time
means to have fun
玩得開心、愉快

all in good time
This means that if you be patient, the thing you are waiting for will happen.
慢慢來，別急，該來的總會來的
I really wish that working hard will make my gym become successful.
我真心希望努力能讓我的健身房成功起來。
All in good time.
別著急，慢慢來。