Correct

恨铁不成钢

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Strokes
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Collocation

1
实在是恨铁不成钢
2
真是恨铁不成钢
3
恨铁不成钢的心情
4
对某人恨铁不成钢

Definition

恨铁不成钢

Literally means:

too impatient to wait the iron hammer-hardened into steel

Actually means:

regret that one cannot live up to expectation

Figuratively, it refers to one's anxiety in expecting someone else to improve or develop. It implies one's anxiety that this expectation may fail. It is often used when the elders expect too much of their juniors while the latter may disappoint them.

比喻焦急期待某人的进步或发展能够达到所希望的程度。含有担心这种愿望不能实现的焦虑心情。多用在长辈对小辈的期望很高,而小辈却有可能让长辈失望的情况。

Example

Used as predicate, attributive, object, etc. (作谓语、定语、宾语等)
1
父母
yán
严厉
píng
批评
men
你们
  
,
wánquán
完全
shì
hèntiěchénggāng
恨铁不成钢
  
,
shì
wèile
为了
men
你们
jiānglái
将来
yǒu
chū
出息
  

Your parents severely criticized you, completely hate iron is not steel, for your future interest.

2
Zhège
这个
xuésheng
学生
qiúshàngjìn
不求上进
  
,
lǎoshī
老师
hěn
nǎo
气恼
  
,
shènzhì
甚至
yǒudiǎn
有点
hèn
  
,
dànshì
但是
zài
hèn
guò
不过
shì
hèntiěchénggāng
恨铁不成钢
de
si
意思
  

This student does not seek progress, the teacher is very angry, even a little hate him, but hate is just hate iron not steel meaning.

3
zhǎng
局长
jīngcháng
经常
gěi
chū
nán
难题
  
,
wéi
de
shì
ràng
dào
得到
duànliàn
锻炼
de
huì
机会
  
,
méi
xiǎngdào
想到
xiè
理解
zhǎng
局长
hèntiěchénggāng
恨铁不成钢
de
xīnqíng
心情
  
,
fǎnér
反而
mányuàn
埋怨
zhǎng
局长
chùchù
处处
wéinán
为难
  

The Secretary often gives him difficult problems, in order to give him the opportunity to exercise, did not expect that he did not understand the Secretary hate iron not steel mood, but complained that the Secretary everywhere embarrassed him.