HSK C4
Correct

/ 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
zhī
wéi
shén
  
,
zài
再乎
  
?

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

2
Yǒu
péng
yuǎnfāng
远方
lái
  
,
不亦乐乎
  
?

Is it not delightful to have friends coming from afar?

3
shí
识字

Can you read?

As a Particle
[used to express supposition, functioning as吧]
4
Chéngbài
成败
zhī
  
,
zài
斯乎
  
?

Does not success or failure hinge on this?

As a Particle
[used in an alternative question, functioning as呢]
5
如此
  
?

Would this do?

6
Rán
然乎
  
,
fǒu
  
?

Yes or no?