Correct

大半 vs 多半

/ dàbàn vs duōbàn /
Strokes

Definition

大半 is an Adverb or Noun, 多半 is just an Adverb, which means “probably; most likely; greater part”.

大半 and 多半 are interchangeable, to indicate “probability in time".

Example

大半 and 多半 are interchangeable, to indicate “probability in time".
1
Shí
diǎn
kāihuì
开会
  
,
jiǔ
diǎnbàn
点半
cóng
jiā
家里
chū
出发
  
,
xiànzài
现在
bàn
大半
  
(
duōbàn
多半
  
)
kuài
dào
liǎo
  

He left home at nine-thirty for the meeting at ten and he must be here soon.

大半 and 多半 are interchangeable, to indicate “probability in quantity".
2
估计
zhège
这个
yuè
de
shēngchǎn
生产
rènwu
任务
  
,
bàn
大半
  
(
duōbàn
多半
  
)
jīng
已经
wánchéng
完成
le
  

It is supposed that most of the production for this month has been done.

3
cāixiǎng
猜想
  
,
rén
bàn
大半
  
(
duōbàn
多半
  
)
dào
le
  

He supposed that most people were present.

大半 and 多半 are interchangeable, to indicate “probability in reason or common sense".
When it is more literary 大半 can also be used.
4
Shìqing
事情
duōbàn
多半
  
(
bàn
大半
  
)
huì
chénggōng
成功
de
  

It is likely to be successful.

5
Zhè
这次
gāokǎo
高考
  
,
duōbàn
多半
  
(
bàn
大半
  
)
kǎo
shàng
  

He is probable to fail the college entrance examination.

6
Zhè
jiàn
shìqing
事情
bàn
大半
dào
遇到
le
cuòzhé
挫折
  

This matter is probably facing with setbacks.

大半 as a Noun means “the greater part” and usually one says 一大半.
7
Láibīn
来宾
zhōng
bàn
大半
shì
wàijiāoguān
外交官
  

More than half of the guests are diplomats.

8
de
cángshū
藏书
zhōng
  
,
bàn
大半
shì
wàiwénshū
外文书
  

More than half of his collection is foreign books.

9
Wénzhāng
文章
jīng
已经
xiě
le
bàn
大半
le
  

He has finished more than half of his article.