conjunction: 以便
老师在黑板上把字写得很大,以便后排的同学也能看清楚。
Lǎo shī zài hēi bǎn shàng bǎ zì xiě dé hěn dà,yǐ biàn hòu pái de tóng xué yě néng kàn qīng chǔ。
The teacher wrote the characters very large on the blackboard so that pupils on the back row could also see them clearly.
[1] Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.