于 (yú) – at, in, from, to, than (written)

Pattern

• Verb + 于 + Time point / Place
• Adjective + 于 + Noun（大于、高于）
• 于 + Time point + Verb

Usage

• A written preposition whose meaning depends on context: time/place (= 在), origin (= 从), target (= 对 / 向) or comparison (= 比, as in 大于, 低于).
• It often follows a verb or adjective.

Examples

1. 1

   这家公司成立于1997年。

   Zhè jiā gōngsī chénglì yú yījiǔjiǔqī nián.

   This company was founded in 1997.

2. 2

   今年的产量高于去年。

   Jīnnián de chǎnliàng gāo yú qùnián.

   This year's output is higher than last year's.