Chinese character 为

Both: choose the pronunciation from the word and its meaning. Read wèi in 为你 (“for you”) and 因为 (“because”); read wéi in 成为 (“become”), 认为 (“think”), and 以为 (“suppose”). Position alone is not a reliable rule.

Pinyin, the system for writing Mandarin pronunciation with Latin letters, marks these tones as wéi and wèi. Numbered spellings use wei2 and wei4 respectively.

Where did 为 come from?

Its ancestor appears in Shang oracle-bone inscriptions. These were inscriptions on bones and shells used for divination. Western Zhou bronze inscriptions preserve later forms. The character evolved through writing styles; these ancestors are not today's exact simplified shape.

Modern analyses commonly interpret early forms as a hand guiding an elephant, linked to handling or doing work. Shuowen, an ancient Chinese character dictionary, instead identified a macaque. The elephant interpretation draws on earlier inscriptions, but the precise original action remains uncertain.

Its grammar changed too. By the Late Tang–Five Dynasties period, 因为 served to connect a reason to a statement: “because.” 作为 developed from a verbal use into “as,” introducing a role.

Is 为 the same as 為 or 爲?

Yes: these are simplified and traditional counterparts. 为 is simplified; 為 and 爲 belong to traditional Chinese writing. Match the writing convention of your text, rather than choosing a form to sound warmer or more formal.