以前 and 以后

以前 is used to indicate that something happened at some time in the past.

以前 S Adverb V O
yǐqián tǎoyàn chī shūcài.
以前 讨厌 吃 蔬菜。

I hated to eat vegetables before.

yǐqián jīngcháng shēngbìng.
以前 经常 生病。

I used to get sick often.

yǐqián méi jiànguò dàhǎi.
以前 见过 大海。

I've never seen the sea before.

以后 is used to indicate that something will happen at some time in the future.

以后 S AV V O
yǐhòu xiǎng xué huàhuà.
以后 画画。

I want to learn painting in the future.

yǐhòu yào zhōngguó.
以后 中国。

I will go to China in the future.

yǐhòu xiǎng pāi diànyǐng.
以后 电影。

I want to make movies in the future.

Notice: 以前 and 以后 can come either before or after the subjects.

Negative are formed by prefixing 不 or 没 to the verb.

以前/以后 S 不/没 V O
yǐqián zúqiú.
以前 足球。

I didn't play football before.

yǐqián méi qùguò xiānggǎng.
以前 去过 香港。

I haven't been to Hongkong before.

yǐhòu shēng xiǎohái.
以后 小孩。

I am not going to have a baby in the future.

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