HSK V7-9
Correct

管用

/ guǎnyòng / 
Strokes

Definition

efficacious/useful

Example

As an Adjective
useful; effective; efficacious
1
Zhīyǒu
只有
fùqīn
父亲
de
的
huà
话
duì
对
zhè
这
háizi
孩子
guǎnyòng
管用
  
。

Only a word from his father has an effect on/upon the child.

2
Xǐ
洗
wēnquán
温泉
duì
对
fēngshībìng
风湿病
guǎnyòng
管用
  
。

Hot springs are efficacious for rheumatism.

3
Nǐ
你
gěi
给
tā
他
jiǎng
讲
le
了
yě
也
bù
不
guǎnyòng
管用
  
。

You will speak to him with no effect.

4
Bù
不
guǎnyòng
管用

be of no effect