( it's a) piece of cake (98上 ~week9)

(1)idiom/phrase:(It's a )piece of cake
(2)meaning: something easy to do.(很簡單的事)
(3)example:
Glad to help. It was a piece of cake
When you know what you're doing, it's a piece of cake.

…do/ does you good. (98上~week 7)

(1)idiom/phrase: …do/ does you good.
(2)meaning: to do someone good means to benefit someone。(對某人有益處)
(3)example:
A healthy diet(健康飲食) will do you good.
A hot bath really does me good.


備註: 畫底線部份可以替換。Do或者does的使用是根據該句的主詞而定。