Correct

从前 vs 以前

/ cóngqián vs yǐqián /
Strokes

Definition

从前 and 以前, both are Time Nouns, which means [before].

Example

从前 and 以前, besides being subject and object, they can also be used as an attributive or adverbial to indicate past tense.
1) The difference is that 以前 can be used immediately after a verb or a verbal phrase, while 从前 cannot. 从前 sounds a longer time ago than 以前.

2) In the two examples, 从前 cannot be used.
1
Shuìjiào
睡觉
qián
以前
  
,
tīng
le
huìr  
一会儿
yīnyuè
音乐
  

Before going to sleep,he listened to the music for a while.

2
必须
zài
huì
会议
kāi
开幕
zhīqián
之前
wánchéng
完成
zhè
fèn
wénjiàn
文件
  
.

You must complete the document before the opening of the meeting.

In the following examples, the two words are interchangeable.
3
Cóngqián
从前
  
(
qián
以前
  
)
men
我们
jiā
zài
tiānjīn
天津
zhù
guò
  

We once lived in Tianjin.

4
Cóngqián
从前
  
(
qián
以前
  
)
shì
cóngqián
从前
  
(
qián
以前
  
)
  
,
xiànzài
现在
bu
yàng
一样
le
  

The past has passed, and things are quite different now.

5
cóngqián
从前
  
(
qián
以前
  
)
lái
guò
zhè
这里
ma
  
?

Have you ever been here before?

6
háishi
还是
cóngqián
从前
  
(
qián
以前
  
)
de
  
,
diǎnr  
一点儿
méi
biàn
  

She is the same as she was.

If there follows a clause such as 从来没……过,以前从来没……过 is used to avoid the repetition of 从.
7
qián
以前
cónglái
从来
méi
tīngshuō
听说
guò
zhège
这个
rén
  

I have never heard this man before.

8
qián
以前
cónglái
从来
méi
guò
li
那里
  

I have never been there before.

Related

从前以前