Correct

不但 vs 不只

/ bùdàn vs bùzhǐ /
Strokes

Formula

1
不但……而且(还, 也, 并且)
2
就是.......也
3
连.......也(都)
4
不只……还……

Definition

不但 and 不只 both are Conjunction, which means [not only].

Example

不但 and 不只 both words are often used the subordinate clause of a complex sentence.
1) In the main clause, there is 而且, 还, 也 or 并且, etc. to correspond to mean "furthermore". Either a positive or a negative structure can follow 不但.

2) 不只 can also be used instead in examples ① and ②, 不但 is more colloquial.
不但……而且(还, 也, 并且)
1
men
我们
liǎ
dàn
不但
rènshi
认识
  
,
érqiě
而且
hěn
  

We are not only acquaintances, but also familiar with each other.

2
men
你们
zhèyàng
这样
chǎo
xià
下去
  
,
dàn
不但
jiějué
解决
le
wèn
问题
  
,
hái
huì
shìqing
事情
nào
jiāng
  

Nothing would be achieved if you argue away this way. Moreover,you just woren it.

In the main clause, 就是.......也,连.......也(都), etc. can also be used to show the extremity of the case.
就是.......也 连.......也(都)
3
Chuán
shǐ
驶入
hǎi
大海
  
,
dàn
不但
  
(
zhǐ
不只
  
)
kàn
bu
jiàn
陆地
  
,
lián
fēiniǎo
飞鸟
dōu
kàndào
看不到
le
  

When we sailed into the sea,the land was out of sight, so was a bird.

4
Zhèzhǒng
这种
qíngkuàng
情况
dàn
不但
  
(
zhǐ
不只
  
)
zài
zhōngguó
中国
shǎoyǒu
少有
  
,
jiùshì
就是
zài
wàiguó
外国
shì
hǎnjiàn
罕见
de
  

This situation is not only rare in China, but also rare in other countries.

Sometimes, the predicate of the subordinate clause is in the negative, and there is 反而, 反倒, 还, etc. in the main clause to show that, instead of inducing due reaction, the condition brings about a contrary one.
In such cases, 不但 is often used. To be more literary, 不只 can also be used.
5
qiú
ge
哥哥
bāngmáng
帮忙
  
,
dàn
不但
guǎn
不管
  
,
fǎnér
反而
xiào
  

I turned to my elder brother. He didn't give me a hand; he made fun of me instead.

6
máng
le
bèizi
一辈子
  
,
tuìxiū
退休
le
  
,
fǎndào
反倒
shìyìng
适应
qīngxián
清闲
de
shēnghuó
生活
le
  

He worked for most of his life, when he retired, he found it difficult to adapt himseflt to a leisurely life.

不只……还……, etc. indicates the increase in quantity and the main verb of the predicate of the subordinate clause is 是.
In these cases, 不但 is not used.
不只……还……
7
Lái
de
rén
客人
zhǐ
shì
zhōngguó
中国
rén
  
,
háiyǒu
还有
xiē
一些
wàiguó
外国
rén
  

Not all of the guests are from China some are from foreign counties.

8
men
他们
jiā
zhǐ
shì
liǎng
dài
rén
  
,
háiyǒu
还有
ye
爷爷
ne
  

There are not just two generations. children. and Darents, in the family. Their grandfather also lives with them.

不但 and 不只 are interchangeable, to the increase in quantity.
9
Lái
de
rén
客人
zhǐ
不只
  
(
dàn
不但
  
)
yǒu
zhōngguó
中国
rén
  
,
háiyǒu
还有
wàiguó
外国
rén
  

Not all of the guests are from China, some of them are foreigners.

10
men
他们
jiā
zhǐ
不只
  
(
dàn
不但
  
)
yǒu
liǎng
dài
rén
  
,
háiyǒu
还有
ye
爷爷
ne
  

There are not just two generations, children and parents, in their family. Their gradfather also lives with them.

11
Shān
山里
zhǐ
不只
  
(
dàn
不但
  
)
shēnghuó
生活
zhāo
hóuzi
猴子
  
,
háiyǒu
还有
其它
xiǎodòng
小动物
  

The mountain is not only home to monkeys, but also to other small animals.

Sometimes 不只 is not a Conjunction, but a phrase with 不 qualifying 只 (adv.), used in a simple sentence.
12
zhǐyǒu
只有
zhǒng
àihào
爱好
  

He has more than one hobby.