HSK C4
Correct

乎

/ hū / 
Strokes

Definition

(classical particle similar to 于[yú]) in/at/from/because/than/(classical final particle similar to 吗[ma], 吧[ba], 呢[ne], expressing question, doubt or astonishment)

Example

As a Particle
[used rhetorically or at the end of a question, functioning as吗]
1
Yī
一
zhī
之
wéi
为
shén
甚
  
,
qí
其
kě
可
zàihū
再乎
  
?

Once is more than enough. How can you do it again?

2
Yǒu
有
péng
朋
zì
自
yuǎnfāng
远方
lái
来
  
,
bùyìlèhū
不亦乐乎
  
?

Is it not delightful to have friends coming from afar?

3
Rǔ
汝
shízì
识字
hū
乎

Can you read?

As a Particle
[used to express supposition, functioning as吧]
4
Chéngbài
成败
zhī
之
jī
机
  
,
qí
其
zài
在
sīhū
斯乎
  
?

Does not success or failure hinge on this?

As a Particle
[used in an alternative question, functioning as呢]
5
Rúcǐ
如此
kě
可
hū
乎
  
?

Would this do?

6
Ránhū
然乎
  
,
fǒu
否
hū
乎
  
?

Yes or no?