HSK 5 HSK V3
Correct

自从

/ zìcóng /
Strokes

Definition

since (a time)/ever since

Example

As a Preposition

from; since

1
cóng
自从
lái
hòu
  
,
bàngōngshì
办公室
jiù
biàn
de
gānjìng
干净
duō
le
  

The office has become cleaner since he came.