therefore
conjunction: 因此yīn cǐ
他经常撒谎，因此大家不相信他。
Tā jīng cháng sā huǎng，yīn cǐ dà jiā bú xiàng xìn tā
He often tells lies so nobody believes him.
because . . . , (therefore)
paired conjunctions: 因为 . . . 所以. . .
因为她专心学习，所以进步很大。
Yīn wéi tā zhuān xīn xué xí，suǒ yǐ jìn bù hěn dà 。
Because she has been concentrating on her studies, (therefore) she has made great progress.
because (of)
conjunction: 由于 yóu yú
由于路太滑，他摔了一跤。
Yóu yú lù tài huá，tā shuāi le yī jiāo 。
Because the road was slippery, he fell over.
[1] Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.
