作

zuo

to make, to do

to act, to work

 制作 manufacture; 动作 movement, action

作家 writer; 作文 to write an essay

a person (亻) in action of handling a tool (乍) to make for the first time a presentation of how to do the work

昨

zuo

yesterday

昨日 yesterday (more formal or literary); 昨晚 last night

a day (日) that suddenly (乍) disappears belongs to yesterday

怎

zen

how, in what way

怎么回事 what’s going on? 

A question of how is formed when you suddenly (乍) reflect in your heart (心) the events of your past, and start asking yourself questions.

乍

zha

suddenly, abruptly

for the firs time

乍一看 at first glance

a person with a tool drills until suddenly he pierces through