Correct

患难知朋友

/ huàn nàn zhī péng yǒu / 
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/患难知朋友-Chinese-idioms-Cchatty-46d33908-040c-4c77-9da5-4cf0acb6ff6b-1612777086.jpg

Collocation

1
这正是患难知朋友
2
真是患难知朋友
3
俗话说/古人说患难知朋友

Definition

患难知朋友

Literally means:

a friend is never known till man has need

Actually means:

a friend in need is a friend indeed

患难 refers to difficulty and calamity.

The phrase means that only through difficulty and calamity can a person find out whether his friends speaker's feeling that he has obtained true help from others when he was in difficulty.

患难,祸和苦难。

指经过患难的考验,才能知道谁是真正的朋友。多用来表示在困难中得到了别人真心帮助的感受。

Example

Used as a minor sentence or as object. (作小句,也可 (作宾语)
1
Gǔrén
古人
shuō
说
  
,
huànnàn
患难
zhī
知
péngyou
朋友
  
,
wǒmen
我们
céngjīng
曾经
yīdào
一道
chūshēngrùsǐ
出生入死
  
,
fēngxiǎn
风险
zài
再
dà
大
wǒ
我
dū
都
huì
会
bāng
帮
tā
他
de
的
  
。

The ancients said, difficult to know friends, we were born and died, the risk is greater I will help him.

2
Huànnàn
患难
zhī
知
péngyou
朋友
  
。
Tā
他
tūrán
突然
xiǎngqǐ
想起
wángyǒng
王勇
gēn
跟
zìjǐ
自己
shì
是
huànnànzhījiāo
患难之交
  
,
ràng
让
wángyǒng
王勇
shèfǎ
设法
yíngjiù
营救
zìjǐ
自己
shì
是
zuì
最
kěkào
可靠
de
的
  
。

A friend who is in distress. He suddenly remembered that Wang Yong and himself are in distress, let Wang Yong try to rescue himself is the most reliable.

3
Wēinàn
危难
jiàn
见
zhēnqíng
真情
  
,
huànnàn
患难
zhī
知
péngyou
朋友
  
。
Méiyǒu
没有
zhèxiē
这些
zhàngyì
仗义
de
的
péngyou
朋友
lái
来
bāng
帮
wǒ
我
dùguò
度过
nánguān
难关
  
,
wǒ
我
kǒngpà
恐怕
yǐjīng
已经
shēnbàimíngliè
身败名裂
le
了
  
,
suǒyǐ
所以
wǒ
我
yǒngyuǎn
永远
dōu
都
wàng
忘
bù
不
le
了
tāmen
他们
  
。

It's hard to see the truth, it's hard to know a friend. Without these righteous friends to help me through this difficult time, I'm afraid I'm in a state of defeat, so I'll never forget them.